SAFE SPEED is defined as that speed where（）.

单项选择题In order for a stand-on vessel to take action in a situation，she must determine that the other vessel（）.

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（）.

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．

A.access
B.process
C.profess
D.recess

单项选择题Five or more short blasts on a vessel’s whistle indicates that she is（）.

A.In doubt that another vessel is taking sufficient action to avoid a collision
B.Altering course to starboard
C.Altering course to port
D.The stand-on vessel and will maintain course and speed

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（）.

A.Crossing ahead of the other
B.Crossing astern of the other
C.Passing port to port
D.Passing starboard to starboard