单项选择题

For optimum stability during jacking operations，mat ballast tanks or spud cans should be（）.

A.empty
B.fully ballasted
C.partially ballasted
D.sealed

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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

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