Whatcausesspeedreductionincylindercushioning?
A. oilflowthroughasmallhole
B. backpressurecreatedinthesystem
C. bothA.andB.
D. noneoftheabove
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Whyarehydrauliccylinderscushioned?
A. cushioningdeceleratesthepistonofacylinder
B. stressandvibrationscanbereduced
C. bothA.andB.
D. noneoftheabove
Cylinderendcushioningdecreasespistonspeedbytheendofthepistonmotion.
A. 对
B. 错
Cylinderendcushioning does not prevent piston motion atthebeginningof a stroke.
A. 对
B. 错
劳动法调整的对象是（ ）
A. 经济关系
B. 行政关系
C. 劳动关系
D. 合同关系
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