單項選擇題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


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1.單項選擇題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

2.單項選擇題（）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

3.單項選擇題（）of my ship’s propeller is very strong.

A.The running reflection
B.The turning effect
C.The moving speed
D.The changing sensibility

4.單項選擇題A crack in the deck plating of a vessel may be temporarily prevented from increasing in length by（）.

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