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
You are on a vessel that cannot comply with the spacing requirement for masthead lights.What is required in this situation（）.
When underway in a channel，you should if safe and practicable（）.
Which vessel is NOT to be regarded as restricted in her ability to maneuver（）.
Vessels should maintain a sharp lookout，especially during December through March，when navigating the right whale’s only known calving grounds which lie off the coasts of（）.
When underway in a channel，you should keep to the（）.
When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
When a vessel is in any doubt as to whether such a situation exists she shall（）that it does exist and act accordingly.
Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of one another（）.
Your vessel is not underway when（）.
When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect（）.