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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

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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

單項(xiàng)選擇題

The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.

A.contraction
B.retraction
C.expansion
D.shrinkage