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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单项选择题

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
C.shoulder type line throwing gun
D.heaving line

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