单项选择题
In a series circuit, which value will remain unchanged at all places in the circuit?（）
A.Voltage
B.Current
C.Resistance
D.Inductance
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Most conducting materials such as copper, aluminum, iron, nickel, and tungsten （）.
A.increase in resistance with increased temperature
B.increase in resistance with decreased temperature
C.decrease in resistance with increased temperature
D.increase in conductance with increased temperature -
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A.trap
B.regulating valve
C.check valve
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A.circuit breaker
B.amplifier
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