单项选择题

An all-round flashing yellow light may be exhibited by a(n)（）.

A.vessel not under command
B.air cushion vessel in the nondisplacement mode
C.vessel towing a submerged object
D.vessel engaged in diving operations

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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

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