单项选择题
Which statement concerning the operation of radar in fog is TRUE?（）
A.Radar ranges are less accurate in fog B.Navigation buoys will always show up on radar C.A sandy beach will show up clearer on radar than a rocky cliff D.Small wooden boats may not show up on radar
单项选择题 Which statement about an estimated position is TRUE?（）
单项选择题 Which procedure(s) shall be used to determine risk of collision? （）
单项选择题 Which general statement concerning radar is FALSE?（）.
