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單項(xiàng)選擇題

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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The function of a rectifier is similar to that of a （）.

A.trap
B.regulating valve
C.check valve
D.filter

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Electrical circuits are protected against overheating by means of a/an （）.

A.circuit breaker
B.amplifier
C.diode
D.capacitor