人耳最敏感的振动频率为
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人耳最敏感的振动频率为
A.20~20000Hz
B.1,000~3,000Hz
C.100~300Hz
D.3,000~9,000Hz
E.9,000~12,000Hz

回答
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C
人耳最敏感的振动频率为
A.20~20000Hz
B.1,000~3,000Hz
C.100~300Hz
D.3,000~9,000Hz
E.9,000~12,000Hz

C