單項(xiàng)選擇題

A knocking sound from one cylinder of an operating air compressor indicates （）.

A.a defective or broken high pressure un-loader
B.a loose valve plate
C.excessive overload
D.no compression

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Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by （）.

A.regulating the oil flow with the six-way valve
B.moving the automatic differential valve
C.moving the receiving tele-motor which regulates the two-way valve
D.varying the angle of a tilting box or eccentricity of a floating ring

單項(xiàng)選擇題

Which characteristic or condition will have the greatest effect on increasing a hydraulic oils viscosity?（）

A.Pour point
B.Cloud point
C.Vacuum
D.Pressure