單項(xiàng)選擇題When a p-n junction is reverse-biased，its junction resistance is（）.

A.high
B.low
C.determined by the components that are external to the device
D.constantly changing


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1.單項(xiàng)選擇題The piecewise linear model，equivalent circuit of the diode consists of（）.

A.a junction capacitor，a battery，a  small resistor，and the ideal diode
B.a battery，asmallresistor，and the ideal diode
C.a battery and the ideal diode
D.the ideal diode

2.單項(xiàng)選擇題The characteristic of an ideal diode are those of a switch that can conduct current（）.

A.in both directions
B.in one direction only
C.in both directions but in only one direction at a time
D.depends on the circuit it is used in

3.單項(xiàng)選擇題Which of the following is not a commonly used semiconductor material’？（）

A.carbon
B.lead
C.silicon
D.germanium