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问题 单项选择题

直流伺服电动机旋转时有大的冲击，其原因如：测速发电机在( )时，输出电压的纹波峰值大于2%。

A．550r/min

B．750r/min

C．1000r/min

D．1500r/min

答案

参考答案：C

单项选择题

视交叉中央部损伤可致（）

A．患侧视野全盲

B．双侧视野颞侧偏盲

C．患侧视野鼻侧偏盲

D．双侧视野对侧同向性偏盲

E．患侧视野颞侧偏盲
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单项选择题

Man: How well are you prepared for your presentation Your turn comes next Wednesday.
Woman: I spent a whole week searching on the net, but came up with nothing valuable.
Question: What did the woman say about her presentation（）。

A. It has nothing to do with the Internet.

B. She needs another week to get it ready.

C. It contains some valuable ideas.

D. It’s far from being ready yet.
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