单项选择题
A probable cause for a turbo generator tripping out on overspeed is a sudden（）
A.loss of field excitation
B.total loss of load
C.large increase in load
D.loss of steam pressure
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A.temperature rise
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单项选择题
When would you ground an electric hand tool?（）
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单项选择题
The load between two steam-driven alternators operating in parallel may be adjusted by varying （）
A.the speed of the alternators
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