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

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A.a combustible element, fuel
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C.oxygen to support the combustion
D.both A and C are correct

3.單項(xiàng)選擇題Which system(s) in the hydraulic systems of crane always hold(s) single side of load?（）

A.hoisting system only
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C.hoisting system and slew and slewing system
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4.單項(xiàng)選擇題Crude oil washing of cargo tanks has the following advantages except for （）

A.reducing the erosion of the cargo tanks
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5.單項(xiàng)選擇題Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）

A.discharge side of the centrifugal pump
B.suction side of the centrifugal pump
C.the lowest point of the cooling water system
D.inlet of the main engine