单项选择题
A stand-on vessel in a crossing situation is allowed to take action when（）.
A.on a collision course B.the vessels will pass within one mile C.it becomes apparent to her that the give-way vessel is not taking appropriate action D.the relative speed of the vessels indicates collision in less than six minutes
单项选择题 A sailing vessel is overtaking a steam vessel in a fairway on International waters，so as to pass on the steam vessel’s port side． The sailing vessel is the（）.
