曲柄滑块机构中，若机构存在死点位置，则主动件为
A
暂无解析
27.1mol氦气（视为单原子分子理想气体），在温度由17℃升高到27℃的过程中保持压强不变，求气体吸收的热量、对外界做的功
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Notuntilrecently_____thatThompsonhadbentellingthetruthallalong
Inmyopinion,theyshoulddosomethingtorewardtheirmost_(produce)employees
_______(safe)needstobeimprovedontherailwaysinthatcountry