(1.5 分)
Which of the followings is the most important method of collision avoidance at sea?
A.RADAR. B.GPS. C.VTS. D.ECDIS.正确答案A
(1.5 分)
Which of the followings is the most important method of collision avoidance at sea?
A.RADAR. B.GPS. C.VTS. D.ECDIS.正确答案A