单项选择题
A.Is restricted in her ability to maneuver
B.Has sounded the danger signal
C.Is not taking appropriate action
D.Has not changed course since risk of collision was determined
单项选择题 If your vessel is the stand-on vessel in a crossing situation（）.
单项选择题 If necessary to avoid collision or allow more time to（）the situation，a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion．
单项选择题 Five or more short blasts on a vessel’s whistle indicates that she is（）.