A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above
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A.time
B.space
C.length
D.visibility
A.the slewing motor
B.the lulling motor
C.the hoisting motor
D.none of the above
A.contraction
B.retraction
C.expansion
D.shrinkage
A.Hydraulic pumps
B.Valves
C.Hydraulic cylinders
D.Hydraulic motors
A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above
最新試題
The general purpose of a heat exchanger is to （）.
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Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The rate of heat transfer from a hot region to a cold region is affected most by the （）.
The major source of chemical contaminants in hydraulic fluid is （）.
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）
The output volume of a positive fixed displacement pump can be changed only by （）.
Low compressor head pressure in a refrigeration system can be caused by（）.
If the head pressure of a reciprocating refrigeration compressor is excessive, （）.
Which of the problems listed would came the discharge temperature of an R-12 refrigeration compressor to increase?（）