單項(xiàng)選擇題When placed in a magnetic field, which of the materials listed will maintain the highest permeability?()

A.Glass
B.Bakelite
C.Soft iron
D.Aluminum


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1.單項(xiàng)選擇題An ohmmeter can be used to measure()

A.current flow in a circuit
B.voltage between two points in a circuit
C.circuit continuity
D.power

4.單項(xiàng)選擇題For practical purposes, in a simple series circuit, the source voltage will be dropped across one resistor if it has().

A.half the resistance of the other resistor
B.a resistance equal to the other
C.at least ten times the resistance of the other
D.a partial short circuit

5.單項(xiàng)選擇題Which is a function of the voltage regulators used with AC generators?()

A.To cut out generators when they are no longer required
B.To cut in additional generators automatically as required
C.To divide the KW load equally between generators operating in parallel
D.To divide reactive current between generators operating in parallel

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