下述对除尘器除尘性能的叙述,哪几项是错误的?

A、重力沉降室能有效地捕集10μm以上的尘粒
B、普通离心式除尘器在冷态实验条件下,压力损失1000pa以下时的除尘效率要求为90%以上
C、回转反吹类袋式除尘器在标态下要求的出口含尘浓度≤50mg/
D、静电除尘器对粒径1~2μm的尘粒,除尘效率可达98%以上
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正确答案:

AB

答案解析:

暂无解析

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PartIIVocabularyandStructure

Directions:Inthisparttherearefortyincompletesentences.Eachsentenceisfollowedbyfourchoices.ChoosetheonethatbestcompletesthesentenceandthenmarkyouranswerontheAnswerSheet.

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A.madeB.indicatedC.forcedD.took

22.Tom’sparentsdiedwhenhewasachild,sohewasbyhisrelatives.

A.grownupB.broughtupC.raisedD.fedup

23.Hereismycard.Let’skeepin.

A.touchB.relationC.connectionD.friendship

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A.whichB.howC.whatD.that

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A.incidentsB.happeningsC.eventsD.accidents

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