题目内容

在光照射下物体发射电子的现象叫做。

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本实验中光阑的作用是用来控制入射光强的大小。

A. 对
B. 错

Mr. White helped the poor old woman ____ of sympathy.

The three wise men asked the woman if her husband was ____ home.

The little boy pointed ____ the house nearby and told me it was his grandfather’s.