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7.如右圖所示,平面地圈中的X軸上,對稱Y軸各有一電磁波波源P及Q,發出相同频率 、相同振幅的正弦電磁波。今在Y軸的兩側選定兩點A、B,欲使A點收訊為最強時 ,B點恰好收訊為零;反之亦然。則兩波源可以
問題詳情
7.如右圖所示,平面地圈中的X軸上,對稱Y軸各有一電磁波波源P及Q,發出相同频率 、相同振幅的正弦電磁波。今在Y軸的兩側選定兩點A、B,欲使A點收訊為最強時 ,B點恰好收訊為零;反之亦然。則兩波源可以
(A)為同相位
(B)恰為反相
(C)相位差(1/4)
(D)相位差(1/8)
(E)理論上無法達成目的。
參考答案
答案:C
難度:非常困難0
統計:A(0),B(2),C(0),D(0),E(3)
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【題組】7.Which of the following statements about early American hotels is NOT mentioned in the passage?
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