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骞存禉姹熷嵎
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10 cm
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A
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0.5 s
B.0.75 s
C
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D.1.5 s
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C
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A
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0.2
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T
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3.0
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y
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2
3
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t
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y
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t
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0.25 s
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t
2
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T
2
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2
t
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2
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)
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1
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4 Hz.
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Hz
锛屽垯鎶婃墜杞姩鐨勯鐜囦负
(
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