单项选择题

重结晶作用只发生在变质作用过程中。（）

A．对
B．错

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答案：无

单项选择题

光电流随加速电位差U的增加而作何变化?加速电位差增加到一定值后,光电流达到饱和值Imax,Imax与哪些因素有关?( ) A.
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非线性,光强; C.
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非线性,光的频率