本题目来源于试卷: Physics Unit11: Vibrations and Waves，类别为 通用国际物理
[单选题]
For a forced vibration, the amplitude of vibration is found to i kq5 09:gv l+eq4hrggdepend onsnrf6i.8g:wr2e6bfmz *lyi:f d4 8g k the
A. sum of the external frequency and the natural frequency.
B. difference of the external frequency and the natural frequency.
C. product of the external frequency and the natural frequency.
D. ratio of the external frequency and the natural frequency.
参考答案: B
本题详细解析:
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