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压力容器结构的安全要求主要有哪些？

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程控值班员启动设备前，应做哪些工作。

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汽轮一压缩机组为什么采用滑动轴承而不采用滚动轴承？

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混凝土外加剂水泥净浆流动度试验中称取试样300g，倒入搅拌锅内。加入推荐掺量的外加剂及87g或105g水，立即搅拌。

A. 正确
B. 错误

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Your network contains a Windows Server Update Services (WSUS) server.You need to ensure that the WSUS server automatically downloads service packs. What should you do first?（）

A. From the Automatic Approvals options, modify the Update Rules list.
B. From the Automatic Approvals options, modify the Advanced settings.
C. From the Products and Classifications options, modify the Products settings.
D. From the Products and Classifications options, modify the Classifications settings.

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