单项选择题

An inconspicuous，partly submerged vessel or object being towed，where the length of tow is 100 meters，shall show（）.

A.yellow lights at each end
B.two red lights in a vertical line
C.a black ball
D.a diamond shape

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单项选择题

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

单项选择题

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

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