题目:
声音在空气、酒精、钢管这几种介质中传播的速度从快到慢的顺序是( ) A.空气、酒精、钢管 B.钢管、空气、酒精 C.空气、钢管、酒精 D.钢管、酒精、空气 |
答案:
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It is well- known that everyone should dress correctly, so we should choose different clothes in different seasons.My hometown is in the north of China. In winter i...