單項(xiàng)選擇題In a three-phase circuit, the phase voltages are ()

A.120°apart
B.160°apart
C.180°apart
D.360°apart


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1.單項(xiàng)選擇題The frequency of an alternator at a given RPM is determined by the ().

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2.單項(xiàng)選擇題The pushbutton on the handset of a ships sound-powered telephone must be depressed to ().

A.talk then released to listen
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D.ring the station being called