A:at; in
B:in; at
C:in; in
D:at; at
读图1和图2, 回答下列问题。
Could you please_____ the piano so loudly? Your brother is having a rest now.
下图是水分子在一定条件下分解的示意图,从中获得的信息不正确的是( )
若α是锐角,且sinα=1﹣3m,则m的取值范围是 ____ ;将cos21°,cos37°,sin41°,cos46°的值,按由小到大的顺序排列是____ .