問題詳情

21.The following signals are distress signals except:
(A)Flames on the vessel.
(B)Basket hanging in the rigging.
(C)A smoke signal giving off orange-coloured smoke.
(D)A rocket parachute flare.

參考答案

答案：B
難度：困難0.294118
統計：A(2),B(5),C(9),D(1),E(0)