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 hand portable fire extinguisher on a ship must be marked with（）.
During storm conditions on a ship，the mooring tensions should be adjusted so that（）.
Each OSV must carry（）.
During which condition should the operator of a pedestal crane shutdown operations?（）
During transfer operations，a quantity of propylamine spills on deck. According to the Chemical Data Guide，the correct procedure would be to（）.
Fire may be spread by which means?（）
During the winter months，the southeast trade winds are（）.
During the day，a vessel picking up a submarine cable shall carry（）.
Each life preserver must be readily accessible to the person for whom it is intended while he or she is（）.