单项选择题
The Coordinator Surface Search (CSS) in a SAR situation should display by night（）.
A.deck lights forward and aft B.a white light over two red lights C.a red light，white light，and blue light in a vertical line D.a distinctive signal promulgated by the CSS
单项选择题 RESULT OF SEARCH NEGATIVE means（）.
单项选择题 One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.
单项选择题 Generally，you can best keep a vessel under steering control when the vessel has（）.
