电磁波在波导管内传播时，其电磁波可以是横电波，也可以是横磁波
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推迟势的重要意义在于它反映了电磁作用具有一定的传播速度
A. 对
B. 错
NO[音频]
A. Manager and assistant.
B. Consultant and client.
C. Director and actress.
D. Presenter and guest.
NO
A. He is a marriage counselor.
B. He is the woman’s family doctor.
C. He is one of the couple’s good friends.
D. He is an expert on interpersonal relations.
NO
A. He decides to break up with his parents.
B. He wants to make decisions for himself.
C. He creates a different identity for himself.
D. He challenges the authority of his teachers.
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