单项选择题
For means of abandonment of a ship，which type of embarkation does not require prior approval by the Coast Guard?（）
A.Movable ladders
B.Fixed ladders
C.Safety booms
D.Elevators
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For H2S detection，sensitized tapes indicate H2S presence by means of discoloration of an exposed spot on the tape. The shade of the color on the spot depends upon the concentration of H2S and（）.
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 -
单项选择题
For an OSV not on an international voyage，an approved substitute for an impulse projected type line throwing appliance is a（）.
A.spring-loaded line thrower
B.hand thrown buoyant line
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单项选择题
（）of the following conditions will cause a vessel’s bottom to be subjected to tension stresses.
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
