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單項(xiàng)選擇題

The gauge pressure inside a container is -0~5kg/cm², then what is the absolute pressure exerted to the inside surface of thin container?（）

A.0~05Mpa
B.0~95Mpa
C.1~05Mpa
D.0~5Mpa

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單項(xiàng)選擇題

The crane jib is raised and lowered by means of （）

A.a mooring winch
B.a hoisting winch
C.a slewing winch
D.a luffing winch

單項(xiàng)選擇題

Which one of three elements for a fire on a tanker vessel is most difficult to eliminate (isolate)?（）

A.a combustible element, fuel
B.energy (resources for ignition) to start the combustion
C.oxygen to support the combustion
D.both A and C are correct