30.摩爾斯信號碼「˙˙˙-」代表下列那個字母?
(A)B
(B)P
(C)V
(D)W
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統計: A(4), B(3), C(41), D(6), E(0) #1199771
統計: A(4), B(3), C(41), D(6), E(0) #1199771