单项选择题

Line losses in a distribution circuit are kept to a minimum by （）.

A.adding rubber insulation conductors to the circuit
B.using higher current and lower voltage increasing the
C.number of thermal relays in the circuit
D.using higher voltage and lower current

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Which of the following components are used to convert alternating current produced in the generator windings to direct current?（）

A.Armature and equalizer
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In a series circuit, which value will remain unchanged at all places in the circuit?（）

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A.increase in resistance with increased temperature
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