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單項(xiàng)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

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單項(xiàng)選擇題

When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the （）.

A.dock
B.hold
C.pedestal
D.machinery space

單項(xiàng)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