题目内容

So, in Mexico, for example, they use_______________ in hospitals. A group of people go around the hospital, visiting the patients, and basically,_______________, by telling them jokes, or_______________.

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Absolutely! They feel better, and_______________.

根据金属的颜色和成分,铜及铜合金可分为( )

A. 纯铜
B. 黄铜
C. 青铜
D. 白铜

白铜是铜和( )的合金

A. 锌
B. 镍
C. 铝
D. 锡

黄铜是铜和( )组成的二元合金

A. 镍
B. 锌
C. 铝
D. 铍

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