单项选择题

以下对于光电传感器描述错误的是：

A.光敏晶体管利用光照强弱来改变电路中的电流大小
B.光电倍增管可以将微弱光信号转换成电信号
C.光电池是一种自发电式的光电器件
D.光敏电阻的电阻值随入射光增强而增大

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单项选择题

In the Mercantilist view of international trade (in a two-country world),___________.

A．both countries could gain from trade at the same time, and the terms of trade were of no consequence for the distribution of the gains.
B．neither country could ever gain from trade.
C．both countries could gain from trade at the same time, but the distribution of the gains depended upon the terms of trade.
D．one country’s gain from trade was associated with a loss for the other country.