3)必需的作业(required activity)和酌量性作业(discretionaryactivity),前者是一个组织必不可少的作业,后者是可以根据管理者的判断进行选择的作业。
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在Web服务交互涉及到有状态资源(如购物车、打印机、打印作业等等)的情况下,WS - Resource Framework是必需的。
WS-Resource Framework is essential where the stateful resources involved in the Web services interaction such as shopping cart, printer, print job, and so on.
TTU是引擎层上所必需的,并且如果在ETL作业中使用了Teradta早期工作台,那么还必须安装在客户机层上。
TTU is required on the engine tier and must also be installed on the client tier if the Teradata legacy stages are used in ETL jobs. TTU depends on the following packages.
家庭作业被继续分配下去——以未曾有过的更多数量——尽管在大多数案例中缺乏这样做是否必需或而有帮助的证据。
Homework continues to be assigned - in ever greater quantities - despite the absence of evidence that it's necessary or even helpful in most cases.
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