单项选择题
A.dock B.hold C.pedestal D.machinery space
In a general cargo crane, （） is fitted to lift the carg...
单项选择题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
The crane is usually mounted on a pedestal to offer ade...
单项选择题The crane is usually mounted on a pedestal to offer adequate （） to the operator.
A.time B.space C.length D.visibility
In a ordinary cargo crane, （） is fitted to rotate the c...
单项选择题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
