单项选择题
An ammeter should be used to measure （）
A.the voltage between two points in a circuit
B.circuit continuity
C.current flow in a circuit
D.total or partial circuit resistance
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When the voltage remains constant and the resistance is increased in a series circuit, the flow of current （）
A.increases by the square of the original value
B.increases
C.remains the same
D.decreases -
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The power factor of an AC generator operating singularly is determined by the （）
A.connected load
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