单项选择题
An occulting light is one in which（）.
A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness
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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 -
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
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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
