判断题

光电传感器的理论基础是光电效应()
正确
错误



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《大学》出自(    )。

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B.《中庸》
C.《礼记》
D.《诗经》

单项选择题

If Slovenia is a large country in world trade, then if it imposes a large set of tariffs on many of its imports, this would

A.increase its exports.
B.harm its terms of trade.
C.have no effect on its terms of trade.
D. improve its terms of trade.