Which transistor amplifier configuration is the most commonly used（）
A. common-emitter
B. common-collector
C. common-base
D. None of these are used more often than the others
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Increasing the temperature of a forward-biased diode ______（）
A. causes forward current to increase
B. causes forward current to decrease
C. has no significant effect on the forward current
D. None of these
In the cut-off region, the base-emitter junction _____（）
A. and the base-collector junctions are both forward-biased
B. and the base-collector junctions are both reverse-biased
C. is forward-biased while the base-collector junction is reverse-biased
D. is reversed-biased while the base-collector junction is forward-biased
The transition capacitance of a diode is a shunt capacitive effect that occurs when the diode _____（）
A. is large
B. is small
C. is forward-biased
D. is reverse-biased
将一定量的KClO3加热后，其质量减少0.48g。生成的氧气用排水集气法收集，若温度为21℃，压力为99591.8Pa，水的饱和蒸汽压为2479.8Pa，氧气的相对分子质量为32.0，则收集的气体体积为（）
A. 188.5
B. cm3
C. B．754
D. cm3
E. C．565.4
F. cm3
G. D．377.6
H. cm3
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