1.通常人們能聽到聲音的頻率範圍是多少?
(A)20Hz~2000Hz
(B)200Hz~20000Hz
(C)500Hz~2000Hz
(D)20Hz~20000Hz .
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統計: A(135), B(153), C(402), D(705), E(0) #340510
統計: A(135), B(153), C(402), D(705), E(0) #340510