单项选择题
Reduced voltage applied to a motor during the starting period will （）.
A.result in decreased acceleration time only
B.lower the starting current and increase accelerating time
C.cause a greater starting torque
D.increase the starting current and pump capacity
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A.adding rubber insulation conductors to the circuit
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Which of the following components are used to convert alternating current produced in the generator windings to direct current?（）
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In a series circuit, which value will remain unchanged at all places in the circuit?（）
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