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

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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

单项选择题

Crude oil washing of cargo tanks has the following advantages except for （）

A.reducing the erosion of the cargo tanks
B.increasing the total quantity of oil to carry
C.reducing the quantity of water contained in oil
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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