题目内容

Leakageinahydrauliccylinderispreventedby

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

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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

Telescopiccylindershave

A. onlytwostageunits
B. onlythreestageunits
C. twoorthreestageunits
D. multi-stageunits

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