题目内容

请论述内光电效应和外光电效应。

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请简述电光效应的涵义。

Claudia plays baseball all the time.

A. 对
B. 错

Sun-hee says she goes swimming twice a week.

A. 对
B. 错

Sun-hee plays tennis about once a month.

A. 对
B. 错