关于声现象，下列说法正确的是()A．常温(15°C)下，空气

关于声现象，下列说法正确的是 $($ 　　 $)$

A．常温 $(15^{°} C)$ 下，空气中的声速大于水中的声速

B．“蒙面歌王”节目中观众是通过音调猜出歌手的

C．声呐利用次声波可以确定鱼群位置和海水深度

D．汽车排气管上安装消声器是在声源处防止噪声的产生

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