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铁、铝、铜及其化合物在生产、生活中有广泛的用途,试回答下列问题:
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同类题1

一束单色光斜射到两种介质的界面上,则

同类题2

根据短文理解,选择正确答案。

    One day an ant was drinking at a small stream and fell in. She made desperate efforts to reach the side, but made no progress at all. The poor ant almost exhausted was still bravely doing her best when a dove saw her. Moved with pity, the bird threw her a blade of grass, which supported her like a raft, and thus the ant reached the bank again. While she was resting and drying herself in the grass, she heard a man come near. He was walking along barefooted with a gun in his hand. As soon as he saw the dove, he wished to kill it. He would certainly have done so, but the ant bit him in the foot just as he raised his gun to fire. He stopped to see what had bit him, and the dove immediately flew away. It was an animal much weaker and smaller than herself that had saved her life.

同类题3

翻译下列语句。

同类题4

下列变化中,能证明硫酸是强酸的事实是(  )

同类题5

北方冬天的地窖放几桶水,可以利用水____时要____,使地窖内的温度不会降的过低而冻坏地窖内存放的菜.
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