单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）
A.hoisting system only
B.hoisting system and luffing system
C.hoisting system and slew and slewing system
D.slewing system only
