周一,创新中学正在进行升旗仪式。对于升旗仪式中的情景,说法正

周一,创新中学正在进行升旗仪式。对于升旗仪式中的情景,说法正确的是

A.同学们听到的国歌声是通过空气传播的     B.播放的国歌声音越大,音调越高

C.国旗匀速上升时,动能不变,势能增加     D.将国旗升起是利用定滑轮完成的

答案

ACD 

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