单项选择题

All fog signals shall be sounded every two minutes with the exception of a vessel（）.

A.underway or making way
B.under sail or under tow
C.anchored or aground
D.not under command or restricted in her ability to maneuver

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单项选择题

According to the Rules，when should lights be displayed?（）.

A.During the hours of darkness
B.At all times when underway
C.From sunset to sunrise and restricted visibility
D.Sunrise to sunset

单项选择题

A vessel towing where the tow prevents her from changing course shall carry（）.

A.only the lights for a vessel towing
B.only the lights for a vessel restricted in her ability to maneuver
C.the lights for a towing vessel and the lights for a vessel restricted in her ability to maneuver
D.the lights for a towing vessel and the lights for a vessel not under command

单项选择题

A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.

A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters