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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最新試題
During which condition should the operator of a pedestal crane shutdown operations?（）
Each hose used for transferring vapors must（）.
During transfer operations，a quantity of propylamine spills on deck. According to the Chemical Data Guide，the correct procedure would be to（）.
Fire protection regulations for towing vessels allow all of these types of fuel piping，EXCEPT（）.
Each hand portable fire extinguisher on a ship must be marked with（）.
During the winter months，the southeast trade winds are（）.
Fire protection and manning regulations for towing vessels state that the Master or person in charge must ensure that all crew members who have not participated in the drills or received the safety orientation（）.
Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
Fittings used for towing must be（）.
During the month of October the Sun’s declination is（）.