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【单选题】
电磁波在自由空间传播时，电场强度 和磁场强度 （）A.
在垂直于传播方向的同一条直线上。
B.
朝互相垂直的两个方向传播。
C.
互相垂直，且都垂直于传播方向。
D.
有相位差（1/2）π。
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