单项选择题

According to the Chemical Data Guide，when burning，the grade B flammable liquid，carbon disulfide produces（）.

A.phosgene gas
B.sulfuric acid gas
C.sulfur dioxide gas
D.carbon tetrachloride

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单项选择题

According to regulations，a cargo hose used for transferring liquefied gases must have a bursting pressure of（）.

A.5 times the maximum working pressure on the hose during cargo transfer
B.one half the designed working pressure
C.4 times the pressure of the cargo pump used for transferring
D.5 times the minimum working pressure on the hose during cargo transfer

单项选择题

A vessel behaves as if all of its weight is acting downward through the center of gravity，and all its support is acting upward through the（）.

A.keel
B.center of buoyancy
C.tipping center
D.amidships section

单项选择题

A spark arrestor（）.

A.keeps sparks from falling into an open tank
B.secures covers on ullage openings
C.prevents sparks from getting out of an engine's exhaust system
D.grounds static electricity