WhentwoACgeneratorsarebeingparalleled,thebreakershouldbeclosedwiththesynchroscopepointermatinginthe（）
A. "slow"direction,justbeforethe12o'clockposition
B. "fast"direction,justafterthe12o'clockposition
C. "fast"direction,justbeforethe12o'clockposition
D. "slow"direction,justafterthe12o'clockposition
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直流电机中，电刷位于（）上。
A. 定子
B. 转子
C. 电枢
D. 外壳
Toprotecttherotorofamotordisassembledformaintenanceoroverhaul,itshouldbe（）
A. suspendedbywireslingsinonecomeroftheshop
B. wrappedinseverallayersofheavypaperorcarboard
C. supportedbyflatwoodblocksontheworkbench
D. returnedtotheframeassoonasthebearingsareremoved
Electricalpowerisexpressedin（）
A. ohms
B. volts
C. amps
D. watts
Accidentalgroundsinashipboardelectricalsystemmustberepairedassoonaspossibleastheywill（）
A. resultinimmediatepoweroutages
B. damagecircuitbreakers
C. appearonthegrounddetectionsystem
D. damageinsulationandmaycauseoutages
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