题目内容

Whendoesaspringtypesingleactingactuatorrecover?

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

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Telescopicactuatorsaredesignedfor

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

Telescopiccylindershave

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

Whatenergyisconvertedintomechanicalenergybyhydrauliccylinders?

A. chemical energy
B. hydraulic energy
C. electricalenergy
D. noneoftheabove

Telescopiccylindersgivegreaterstrokelengththanstandardcylinders.

A. 对
B. 错