A.air temperature at the time of the exposure
B.air pressure at the time of the exposure
C.humidity at the time of exposure
D.duration of the exposure
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A.spring-loaded line thrower
B.hand thrown buoyant line
C.shoulder type line throwing gun
D.heaving line
A.Concentration of weight aft
B.Concentration of weight forward
C.Concentration of weight amidships
D.Concentration of weight at both ends of the vessel
A.The running reflection
B.The turning effect
C.The moving speed
D.The changing sensibility
A.cutting a square notch at each end of the crack
B.drilling a hole at each end of the crack
C.slot-welding the crack
D.welding a doubler over the crack
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Generally speaking，in the Northern Hemisphere，when winds are blowing from between SE and SW the barometric reading（）.
How is the external flotation bladder of an immersion suit inflated?（）
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Hot air can hold（）.
How can you estimate the position of a tropical storm’s center?（）
Guide tolerances during elevation of the jack-up rig will（）.
Good seamanship while towing in heavy weather requires all of the following EXCEPT（）.
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From your position you observe a rotating white and green light to the north. This light is most likely（）.