超星 - Cushioning and mounting of cylinders - 查题吧

单选题

Whatcausesspeedreductionincylindercushioning?

A. oilflowthroughasmallhole
B. backpressurecreatedinthesystem
C. bothA.andB.
D. noneoftheabove

单选题

Whyarehydrauliccylinderscushioned?

A. cushioningdeceleratesthepistonofacylinder
B. stressandvibrationscanbereduced
C. bothA.andB.
D. noneoftheabove

判断题

Cylinderendcushioningdecreasespistonspeedbytheendofthepistonmotion.

A. 对
B. 错

判断题

Cylinderendcushioning does not prevent piston motion atthebeginningof a stroke.

A. 对
B. 错

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