题目内容

Whichoftheseactionsdoesahydrauliccylinderperform?

A. pushing
B. lifting
C. bothA.andB.
D. noneoftheabove

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Leakageinahydrauliccylinderispreventedby

A. seals
B. cylinderhead
C. cylindercap
D. noneoftheabove

Forasingleactingactuator,thepistonrecoversby

A. springforce
B. load
C. bothoftheabove
D. noneoftheabove

Whendoesaspringtypesingleactingactuatorrecover?

A. oilforceismorethanspringforce
B. oilforceislessthanspringforce
C. oilforceandspringforcearesame
D. noneoftheabove

Telescopicactuatorsaredesignedfor

A. longerextension
B. smallerfoldedsize
C. bothoftheabove
D. noneoftheabove

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