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

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單項(xiàng)選擇題

The crane is usually mounted on a pedestal to offer adequate （） to the operator.

A.time
B.space
C.length
D.visibility

單項(xiàng)選擇題

In a ordinary cargo crane, （） is fitted to rotate the crane.

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

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