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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Each hand portable，semi-portable and fixed fire extinguishing unit on a ship must be tested and inspected at least once every（）.
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 dampers prevent the spread of fire by（）.
Each OSV must carry（）.
During the manufacture of line，yarns are twisted together in the（）.
Each EPIRB required on a ship shall be stowed in a manner which will permit（）.
During the day，a vessel picking up a submarine cable shall carry（）.
Fire protection regulations apply to those towing vessels（）.
Each hand portable fire extinguisher on a ship must be marked with（）.
Each EPIRB required on an OSV shall be tested using the integrated test circuit and output indicator every（）.