2.摩斯碼(· ·-·)係表示字母:
(A)A
(B)F
(C)H
(D)O
答案:登入後查看
統計: A(1), B(8), C(1), D(0), E(0) #2401558
統計: A(1), B(8), C(1), D(0), E(0) #2401558