When required in tonnage quantities, oxygen is prepared by the’ fractional disti

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问题 When required in tonnage quantities, oxygen is prepared by the’ fractional distillation of liquid air. The process takes advantage of the fact that when a ______ gas is allowed to expand, it cools. (compress)

选项

答案 compressed

解析

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When required in tonnage quantities, oxygen is prepared by the’ fractional disti

Inthispart,youarerequiredtowriteacompositionentitledChina’sOver

______theymustputasidetheirprejudices,______.wemustbepreparedtoacc

Mr.Mortongradually______aknowledgeofthesubject.A、attainedB、requiredC、a

Whenrequiredintonnagequantities,oxygenispreparedbythe’fractionaldisti

Anextensivefoundationinthebasicsciencesshouldberequiredofallscience

______,wateriscomposedoftwopartshydrogenandonepartoxygen.A、Asisknow

Heisconstantlylate,andill-preparedwhenhedoesfinallyarrive.Heisjeopa

Inthispart,youarerequiredtowriteacompositionentitledOnSustainabl

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theymustputasidetheirprejudices,.wemustbepreparedtoacc