单项选择题
The common way to obtain your ship’s position is（）.
A.keeping a close watch and lookout B.taking a radar range and bearing C.observing a radar target and listening to signals D.keeping a well clear caution
单项选择题 The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.
单项选择题 The articulated light is superior to other types of buoys because（）.
单项选择题 The ARPA may swap targets when automatically tracking if two targets（）.
