A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects
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A.Between sunset and sunrise
B.Only between 8 AM and 4 PM
C.During daylight hours in any visibility
D.During daylight hours in unrestricted visibility only
A.red lights
B.red lights and two white lights
C.red lights with a white light in between
D.white lights with a red light in between
A.will be coming to periscope depth
B.will be coming to the surface
C.is on the bottom in distress
D.is in distress and will try to surface
A.need not show the lights for a vessel engaged in towing，if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing
A.fishing
B.in distress
C.at anchor
D.not under command
最新試題
When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.
You are under sail and overtaking a tug and tow.Which action is correct（）.
When ship at anchor she shall be deemed to be（）.
You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should（）.
Which vessel is NOT classified as “restricted in her ability to maneuver” （）.
You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.
Which one of two crossing power-driven vessels has the right of way in a fog（）.
You are on a vessel that cannot comply with the spacing requirement for masthead lights.What is required in this situation（）.
Which statement correctly applies to a situation where a sailing vessel is overtaking a power-driven vessel（）.
You are underway in reduced visibility.You hear the fog signal of another vessel about 20° on your starboard bow.Risk of collision may exist.You should（）.