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单选题

Sound is audible to human beings only if the frequency is______.

发布日期:2022-06-13

Sound is audible to human beings only if the frequ...
A

fewer than about 20 vibrations per second

B

more than about 20,000 vibrations per second

C

about in a range of 20 to 20,000 vibrations per second

D

120 vibrations per second

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