使用 B2985A/87A 进行绝缘材料电阻率的测量

基本文件流程错误 SQL 调试

/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/public/index.php ( 0.79 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/autoload.php ( 0.17 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/composer/autoload_real.php ( 2.49 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/composer/platform_check.php ( 0.90 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/composer/ClassLoader.php ( 14.05 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/composer/autoload_static.php ( 4.89 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/helper.php ( 7.35 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/stubs/load_stubs.php ( 0.16 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Exception.php ( 1.69 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Facade.php ( 2.71 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/symfony/polyfill-php80/bootstrap.php ( 1.50 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/symfony/polyfill-php72/bootstrap.php ( 1.89 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/symfony/polyfill-mbstring/bootstrap.php ( 7.07 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/symfony/var-dumper/Resources/functions/dump.php ( 0.79 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-captcha/src/helper.php ( 1.37 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/App.php ( 14.17 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Container.php ( 15.38 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/psr/container/src/ContainerInterface.php ( 1.02 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/provider.php ( 0.19 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Http.php ( 6.12 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/helper/Str.php ( 7.28 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Env.php ( 4.64 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/common.php ( 7.71 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/helper.php ( 18.44 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Config.php ( 5.03 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/app.php ( 1.55 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/facade/Env.php ( 1.67 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/facade/App.php ( 2.73 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/cache.php ( 0.80 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/captcha.php ( 1.02 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/console.php ( 0.23 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/cookie.php ( 0.49 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/database.php ( 2.30 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/filesystem.php ( 0.63 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/lang.php ( 0.75 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/log.php ( 1.37 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/middleware.php ( 0.19 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/route.php ( 1.54 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/session.php ( 0.57 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/trace.php ( 0.34 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/config/view.php ( 0.82 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/event.php ( 0.25 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Event.php ( 6.96 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Lang.php ( 7.60 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/lang/zh-cn.php ( 12.88 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/initializer/Error.php ( 3.19 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/initializer/RegisterService.php ( 1.33 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/services.php ( 0.22 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/service/PaginatorService.php ( 1.52 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Service.php ( 1.67 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/service/ValidateService.php ( 0.99 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/service/ModelService.php ( 1.76 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-captcha/src/CaptchaService.php ( 0.52 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-multi-app/src/Service.php ( 1.08 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-trace/src/Service.php ( 0.77 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Middleware.php ( 6.78 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/initializer/BootService.php ( 0.77 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/Paginator.php ( 11.80 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Validate.php ( 46.10 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/Model.php ( 25.12 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/model/concern/Attribute.php ( 17.61 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/model/concern/RelationShip.php ( 26.12 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/model/concern/ModelEvent.php ( 2.27 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/model/concern/TimeStamp.php ( 5.70 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/model/concern/Conversion.php ( 10.41 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/contract/Arrayable.php ( 0.09 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/contract/Jsonable.php ( 0.13 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Db.php ( 2.87 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/DbManager.php ( 8.49 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Log.php ( 8.50 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Manager.php ( 3.98 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/psr/log/Psr/Log/LoggerInterface.php ( 3.04 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Cache.php ( 4.79 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/psr/simple-cache/src/CacheInterface.php ( 4.50 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/helper/Arr.php ( 15.54 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/cache/driver/File.php ( 7.41 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/cache/Driver.php ( 8.06 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/contract/CacheHandlerInterface.php ( 2.25 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Console.php ( 22.65 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/Request.php ( 0.09 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Request.php ( 54.04 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/middleware.php ( 0.26 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Pipeline.php ( 2.61 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-trace/src/TraceDebug.php ( 2.94 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/middleware/SessionInit.php ( 2.02 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Session.php ( 1.80 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/session/driver/File.php ( 6.28 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/contract/SessionHandlerInterface.php ( 0.87 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/session/Store.php ( 7.26 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-multi-app/src/MultiApp.php ( 7.39 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Route.php ( 23.74 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/RuleName.php ( 5.30 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/Domain.php ( 5.41 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/RuleGroup.php ( 13.91 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/Rule.php ( 22.98 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/cn/route/route.php ( 2.94 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/facade/Route.php ( 4.84 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/RuleItem.php ( 9.23 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/dispatch/Url.php ( 3.42 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/dispatch/Controller.php ( 6.61 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/Dispatch.php ( 6.93 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/cn/controller/Index.php ( 13.97 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/cn/controller/Base.php ( 4.31 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/app/BaseController.php ( 2.04 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/facade/View.php ( 1.71 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/facade/Db.php ( 0.94 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/connector/Mysql.php ( 4.39 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/PDOConnection.php ( 51.38 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/Connection.php ( 7.67 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/ConnectionInterface.php ( 4.56 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/builder/Mysql.php ( 14.31 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/Builder.php ( 40.09 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/Query.php ( 10.64 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/BaseQuery.php ( 35.59 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/TimeFieldQuery.php ( 7.50 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/AggregateQuery.php ( 3.00 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/ModelRelationQuery.php ( 16.06 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/ResultOperation.php ( 6.29 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/Transaction.php ( 2.85 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/WhereQuery.php ( 16.22 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/JoinAndViewQuery.php ( 6.86 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/ParamsBind.php ( 3.36 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/concern/TableFieldInfo.php ( 2.51 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/log/driver/File.php ( 6.17 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/contract/LogHandlerInterface.php ( 0.86 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/log/Channel.php ( 6.54 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/event/LogRecord.php ( 0.86 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-helper/src/Collection.php ( 16.10 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/View.php ( 4.41 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-orm/src/db/Raw.php ( 1.39 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Response.php ( 8.60 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/response/View.php ( 3.27 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/Cookie.php ( 6.28 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-view/src/Think.php ( 8.42 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-template/src/Template.php ( 46.85 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-template/src/template/driver/File.php ( 2.33 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/runtime/cn/temp/e69a16fc430a942ef22469a1889a86ba.php ( 19.95 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-multi-app/src/Url.php ( 7.69 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/framework/src/think/route/Url.php ( 14.65 KB )
/home/itwangjian3iet8wxamnuggjhiiavn/wwwroot/vendor/topthink/think-trace/src/Html.php ( 4.49 KB )

CONNECT:[ UseTime:0.000680s ] mysql:host=127.0.0.1;port=3306;dbname=itwangjian;charset=utf8
SHOW FULL COLUMNS FROM `qing_category` [ RunTime:0.001013s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 11 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000269s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 12 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000298s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 13 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000207s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 39 AND `status` = 1 ORDER BY `listorder` ASC [ RunTime:0.000201s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 0 ORDER BY `listorder` ASC [ RunTime:0.000173s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 1 ORDER BY `listorder` ASC [ RunTime:0.000153s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 11 ORDER BY `listorder` ASC [ RunTime:0.000143s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 12 ORDER BY `listorder` ASC [ RunTime:0.000138s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 13 ORDER BY `listorder` ASC [ RunTime:0.000137s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 14 ORDER BY `listorder` ASC [ RunTime:0.000811s ]
SELECT `id`,`cate_name`,`parent_id`,`index_template` FROM `qing_category` WHERE `parent_id` = 39 ORDER BY `listorder` ASC [ RunTime:0.000220s ]
SHOW FULL COLUMNS FROM `qing_ad` [ RunTime:0.000781s ]
SELECT * FROM `qing_ad` WHERE `type_id` = 4 [ RunTime:0.000285s ]
SHOW FULL COLUMNS FROM `qing_config` [ RunTime:0.000732s ]
SELECT `value`,`id` FROM `qing_config` [ RunTime:0.000280s ]
SHOW FULL COLUMNS FROM `qing_archives` [ RunTime:0.000929s ]
SELECT * FROM `qing_archives` WHERE `id` = 96 LIMIT 1 [ RunTime:0.000376s ]
SELECT * FROM `qing_category` WHERE `id` = 34 LIMIT 1 [ RunTime:0.000274s ]
SELECT * FROM `qing_ad` WHERE `type_id` = 2 ORDER BY `listorder` ASC [ RunTime:0.000205s ]
SELECT `id`,`parent_id`,`cate_name`,`index_template` FROM `qing_category` WHERE ( id=34 ) LIMIT 1 [ RunTime:0.000218s ]
SELECT `id`,`parent_id`,`cate_name`,`index_template` FROM `qing_category` WHERE ( id=21 ) LIMIT 1 [ RunTime:0.000166s ]
SELECT `id`,`parent_id`,`cate_name`,`index_template` FROM `qing_category` WHERE ( id=39 ) LIMIT 1 [ RunTime:0.000147s ]
SELECT * FROM `qing_category` WHERE `parent_id` = 21 [ RunTime:0.000155s ]

联系我们

EN

材料表征

器件与设备

材料表征

泰灵思公司

技术白皮书及应用说明 >

使用 B2985A/87A 进行绝缘材料电阻率的测量