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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2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題What type of valve is used to direct the flow of hydraulic fluid?()

A.Relief valve
B.Direction control valve
C.Stop valve
D.Pressure control valve