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

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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（）.

A.privileged vessel and would sound two short blasts
B.burdened vessel and would sound two prolonged blasts followed by two short blasts
C.burdened vessel and would sound no whistle signal
D.privileged vessel and would sound no whistle signal