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【单选题】
一平面简谐波表达式为 (SI),则该波的频率 (Hz),波速 (m/s)及波线上各点振动的振幅 (m)依次为( )A.
0.5， 0.5， 0.05
B.
0.5， 0.5， -0.05
C.
0.5， 1， -0.05
D.
2， 2， 0.05
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