单项选择题
A.You must keep your course and speed
B.You may change course and speed as the other vessel must keep clear
C.The other vessel must keep her course and speed
D.Both vessels must keep their course and speed
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（）.
单项选择题 Every vessel which is directed by these Rules to keep out of the way of another vessel shall，if the circumstances of the case admit，avoid（）.