Alightsiglinalconsistingofthreeflashesmeans______A

A light siglinal consisting of three flashes means ______.

A.I an in doubt as to your actions

B.My engines are full speed astern

C.I desire to overtake you

D.I am operating astern propulsion

正确答案：D
由三闪组成的灯光信号表示我船正在后退