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【单选题】
关于波长,下列说法正确的是A.
机械振动在一个周期内传播的距离就是一个波长
B.
在波形图上位移相同的相邻两质点间的距离等于一个波长
C.
在波形图上速度相同的相邻两质点间的距离等于一个波长
D.
在波形图上振动情况总是相同的两质点间的距离等于一个波长
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