阿摩線上測驗
21. Which is necessary for two sources of waves to be "coherent"?
(A) They are "in phase"；
(B) They have the same amplitude；
(C) They have the same frequency；
(D) All；
(E) None.
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統計： A(0), B(0), C(1), D(1), E(0) #3188052
統計： A(0), B(0), C(1), D(1), E(0) #3188052
