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2. 於船舶無線電通信中,若發射標識為 J3E,則其代表何種意義?(A) 單路頻率調變(B) 單路相位調變(C) 單邊帶全載波(D) 單邊帶遏止載波
問題詳情
2. 於船舶無線電通信中,若發射標識為 J3E,則其代表何種意義?
(A) 單路頻率調變
(B) 單路相位調變
(C) 單邊帶全載波
(D) 單邊帶遏止載波
參考答案
答案:D
難度:困難0.25
統計:A(5),B(0),C(1),D(3),E(0)
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9. 設0 ≤ θ≤π,且2sin 2θ+11cosθ - 7 = 0,則θ= (A) (B) (C) (D) 。
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