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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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 -
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
