30.翻譯：航行警告電傳接收機已打開。
(A)TELEX receiver is switched on.
(B)NAVTEX receiver is switched on.
(C)DSC receiver is switched on.
(D)EGC receiver is switched on.

答案：登入後查看
統計： A(2), B(12), C(0), D(1), E(0) #2400671