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在芭蕾舞史上成为浪漫主义和现实主义转折的芭蕾舞作品是（）。

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You work as a network exchange administrator at company.com.the company.com network currently consists of a single active directory forest containing a single domain named company.com.the company.com organization makes use of microsoft exchange server 2010 as their messaging solution.company.com has recently added a distribution group named king distribute.during the course of the business week you receive instruction from company.com to ensure that a user named dean austin is able to add and remove members from king distribute whilst also making sure that dean austin cannot make any changes to any of the other groups. What should you do？（）

A. you should consider having dean austin assigned the distributions groups management role.
B. you should consider having dean austin assigned the my distributions groups management role.
C. you should consider having dean austin added to king distribute’ s managed by list.
D. you should consider having dean austin assigned as a group moderator forking distribute.

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工作前应检查电源电压，电源电压不得低于360伏。

A. 正确
B. 错误

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分馏塔顶回流中断有什么影响？（KHD：事故判断处理及应变能力）

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以下关于天线的水平波瓣、垂直波瓣的说法，正确的是哪些（）。

A. 在天线的水平面（垂直面）方向图上，相当于主瓣最大点功率增益下降3dB的两点之间所张的角度，定义为天线的水平（垂直）波瓣宽度
B. 天线辐射的大部分能量都集中在波瓣宽度内，波瓣宽度的大小反映了天线的辐射集中程度
C. 全向天线的水平波瓣宽度为360度，而定向天线的常见水平波瓣宽度有20、30、65、90、105、120、180度等多种
D. 天线的垂直波瓣宽度一般在3－80度之间，基站天线采用较多的是5－18度之间的天线
E. 天线的增益是和天线的水平和垂直波瓣宽度密切相关，一般来说，波瓣宽度越小，增益越大

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