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[主观题]
人耳最敏感的振动频率为()。
人耳最敏感的振动频率为()。
A.20~100Hz
B.100~300Hz
C.1,000~3,000Hz
D.3,000~9,000Hz
E.9,000~12,000Hz
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A.20~100Hz
B.100~300Hz
C.1,000~3,000Hz
D.3,000~9,000Hz
E.9,000~12,000Hz
第6题
A.0~20Hz
B.20~20,000Hz
C.30,000~40,000Hz
D.40~200Hz
E.20,000~30,000Hz
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