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
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相关考题
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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 -
单项选择题
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 -
单项选择题
Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?（）
A.Hydraulic pumps
B.Valves
C.Hydraulic cylinders
D.Hydraulic motors
