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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

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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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The author of the Wealth of Nations was（）

A. David Ricardo
B. Paul Samuelson
C. Adam Smith
D. Karl Marx

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Which of the following are reasons why increasing marginal costs of production arise？I. Different products use inputs to production in different proportions.II. Different inputs are better utilized in

A. III
B. II and III
C. I and II and III
D. I and II

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All of the following can lead to an increase in the demand for ice cream, a normal good, EXCEPT（）

A decrease in income
B. An increase in the price of popsicles
C. A new scientific study that finds eating ice cream does not cause weight gain
D. A 10% increase in population

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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（）

The author of the Wealth of Nations was（）

Which of the following are reasons why increasing marginal costs of production arise？I. Different products use inputs to production in different proportions.II. Different inputs are better utilized in

All of the following can lead to an increase in the demand for ice cream, a normal good, EXCEPT（）

A. is large
B. is small
C. is forward-biased
D. is reverse-biased