单项选择题
The correct phase rotation of a three-phase alternator can be checked with a（）
A.dynamometer
B.power factor meter
C.three-phase motor
D.polyphase voltmeter
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A.loss of field excitation
B.total loss of load
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All of the following operating characteristics are listed on the name-plates of motors used aboard ship except the（）
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When would you ground an electric hand tool?（）
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B.When it is an AC machine
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