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 （）.

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

单项选择题Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of one another（）.

A.The vessel which has the other on her own starboard side
B.The vessel which has the other on her own port side
C.The one which hears the other's fog signal first
D.Neither vessel is the stand-on vessel

单项选择题Which vessel is NOT to be regarded as restricted in her ability to maneuver（）.

A.A vessel transferring provisions while underway
B.A pushing vessel and a vessel being pushed when connected in a composite unit
C.A vessel servicing a navigation mark
D.A vessel launching aircraft

单项选择题Which vessel is NOT classified as “restricted in her ability to maneuver” （）.

A.A vessel picking up a navigation mark
B.A vessel transferring cargo while underway
C.A vessel whose anchor is fouled
D.A vessel in a towing operation that restricts the ability of the vessel and her tow to change their course