单选题（）is not installed on the emergency switchboard.AAmmeterBVoltmeterCWattmeterDSynchroscope
单选题
（）is not installed on the emergency switchboard.
A
Ammeter
B
Voltmeter
C
Wattmeter
D
Synchroscope
参考解析
解析：
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单选题（）is not installed on the emergency switchboard.AAmmeter and changeover switchBSpeed governor deviceCSynchroscopeDWattmeter
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