单项选择题
The prohibition against displaying lights which may be confused with required navigation lights applies（）.
A.from sunset to sunrise and during restricted visibility
B.only when other vessels are in the area
C.only when operating in a traffic separation scheme
D.only when under tow
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The International Regulations for Preventing Collisions at Sea contain the requirements for （）.
A.lights that must be displayed on anchor buoys
B.the display of load line markings
C.minimum horsepower for tugs involved in rig moves
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单项选择题
The duration of a prolonged blast of the whistle is（）.
A.2 to 4 seconds
B.4 to 6 seconds
C.6 to 8 seconds
D.8 to 10 seconds -
单项选择题
Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）
A.Geographical positions outlining the area of the sector
B.True bearings as observed from the ship toward the light
C.An outline of the area of the sector
D.True bearings as observed from the light toward the ship
