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．

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

单项选择题Every vessel which is（）to keep out of the way of another vessel shall，so far as possible，take early and substantial action to keep well clear.

A.detected
B.decided
C.directed
D.deceased

单项选择题Every vessel shall（）maintain a proper look-out by sight and hearing as well as by all available means appropriate in prevailing circumstances and conditions so as to make a full appraisal of the situation and of the risk of collision.

A.in fog
B.at night
C.in narrow fairway
D.at all times