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问题 问答题 简答题

汽轮机水冲击主要有哪些危害？

答案

参考答案：

机组轴向推力大增，导致推力瓦烧毁，汽缸、转子受到急剧冷却及冲击应力而产生变形、裂纹等，甚至造成机组动静间隙消失发生碰磨、大轴弯曲等。

单项选择题

2013年3月19日，习 * * 在接受金砖国家媒体联合采访时提出，中国这样一个大国，领导者要深入了解国情，了解人民所思所盼，要有“治大国、如烹小鲜”的态度。以下最接近这种治国理念的是()

A.尊重国情，尊重民心，尊重规律 

B.强化理论，强化技术，强化创新 

C.坚持改革，坚持开放，坚持发展 

D.维护稳定，维护传统，维护成规
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单项选择题

At a basic level,cloud computing is simply a means of delivering ITresources as ____(71)___.Almost all IT resources can be belivered as a cloud service:applications,compute power,storage capacity,networking,programming tools,even communication services and collaboration ____(72)____. Cloud computing began as large-scale Internet service providers such as Google,Amazon,and others built out their infrastructure.Anarchitecture emerged:massively scaled,____(73)____ distributed system resources,abstracted as virtual IT services and managed as continuously configured,pooled resources.In this architecture,the data is mostly resident on ___(74)___ "somewhere on the Internet" and the application runs on both the "cloud servers" and the user’s browser. Both clouds and grids are built to scale horizontally very efficiently.Both are built to withstand failures of ___(75)___ elements or nodes.Both are charged on a per-use basis.But while grids typically process batch jobs,with a defined start and end point,cloud services can be continuous.What’s more,clouds expand the types of resources available - file storage,databases,and Web services - and extend the applicability to Web and enterprise applications.

（75）处填（）。

A．entire

B．individual

C．general

D．separate
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