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【单选题】
两相干波源 S 1 和 S 2 的振动方程分别是 和 .S 1 距 P 点 1 个波长, S 2 距 P 点 1.25 个波长.传播过程中振幅不变,则两波同时传到 P 点时的合振幅是: A . B . C 0 D .
A.
A
B.
B
C.
C
D.
D
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