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
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相关考题
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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 -
单项选择题
In a general cargo crane, （） is fitted to raise or lower the jib.
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above -
单项选择题
External and internal leakage in hydraulic systems may be caused by （）.
A.unusual vibration
B.excessive worn parts
C.abnormal pressure
D.any of the above
