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问题
单项选择题
梅奥进行第一次实证研究是在( )
A．费城发电厂
B．费城纺织厂
C．费城水利厂
D．费城农具厂
答案
参考答案：
B
选择题
The hotel wasn't particularly good. But I _____ in many worse hotels.
A. was staying
B. stayed
C. would stay
D. had stayed
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问答题 简答题
试述真空断路器操作过电压种类及抑制方法。
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