單項選擇題() is the production of pure water from sea water by evaporation and re-condensing.

A.Evaporation
B.Circulation
C.Condensation
D.Distillation


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1.單項選擇題Which of the following can be used in hydraulic transmission system?()

A.Hydraulic oil
B.Animal oil
C.Light oil
D.Fuel oil

3.單項選擇題Cargo handling unit is rated according to the () to be lifted.

A.cargo crane
B.jib
C.safe working load
D.oil pressure

5.單項選擇題In a general cargo crane, () is fitted to lift the cargo load.

A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above