我們對遠出的人說話時，常會用手為住嘴巴，讓聲音不容易分散，此現象主要利用升坡的哪一種特性?(A)聲波可以利用不同介質傳播(B)聲波是因為物體震動而產生(C)聲波傳播時遇到障礙物會被反射(D)不同頻

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4.我們對遠出的人說話時，常會用手為住嘴巴，讓聲音不容易分散，此現象主要利用升坡的哪一種特性?
(A)聲波可以利用不同介質傳播
(B)聲波是因為物體震動而產生
(C)聲波傳播時遇到障礙物會被反射
(D)不同頻率的聲波會有不同音調

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