You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.

单项选择题You are under sail and overtaking a tug and tow.Which action is correct（）.

A.The power-driven tug must maneuver to avoid collision
B.You must maneuver to avoid the tug and tow
C.You must maneuver to avoid collision only if the tug is to leeward and the wind is on your port side
D.Both vessels are required to maneuver to avoid collision

单项选择题You are on a vessel that cannot comply with the spacing requirement for masthead lights.What is required in this situation（）.

A.The vessel must carry only the lights that comply with the rules; the others may be omitted
B.The vessel's lights must comply as closely as possible，as determined by her government
C.The vessel must be altered to permit full compliance with the rules
D.An all-round light should be substituted for the after masthead light and the stern light

单项选择题You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.

A.No fog signal
B.A prolonged blast at intervals never to exceed more than two minutes
C.A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes
D.A prolonged blast followed by three short blasts at intervals never to exceed more than one minute

单项选择题You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should（）.

A.hold course and sound a two blast whistle signal
B.hold course and sound no whistle signal
C.change course to the right and sound one blast
D.hold course and sound two prolonged and two short blasts

单项选择题You are aboard the give-way vessel in a crossing situation．What should you NOT do in obeying the Rules（）.

A.Cross ahead of the stand-on vessel
B.Make a large course change to starboard
C.Slow your vessel
D.Back your vessel