单项选择题
Which procedure(s) shall be used to determine risk of collision? （）
A.Watching the compass bearing of an approaching vessel B.Systematic observation of objects detected by radar C.Long-range radar scanning D.All of the above
单项选择题 Which general statement concerning radar is FALSE?（）.
单项选择题 Which condition indicates that your radar needs maintenance?（）
单项选择题 Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel? （）
