夜色资源站www国产在线资源,国产偷窥熟妇高潮呻吟,潮湿的心动漫在线观看免费未删减,欧美日韩国产成人精品

當前位置:考試網  > 試卷庫  > 技能鑒定  > 其他類  > 石油石化職業技能鑒定  > 壓風機司機  > 什么是壓縮機?
試題預覽

什么是壓縮機?

查看答案
收藏
糾錯
正確答案:

壓縮機是一種壓縮氣體提高氣體壓力或輸送氣體的機器,叫壓縮機又叫壓氣機和壓風機、各種壓縮機都屬于動力機械,能將氣體體積縮小,壓力增高,具有一定的動能,可作為機械動力或其他用途。根據所壓縮的氣體不同,稱空氣壓縮機,氧氣壓縮機、氨壓縮機、天然氣壓縮機等等。

答案解析:

暫無解析

你可能感興趣的試題

安全生產責任制體系的橫向到邊是指各職能部門(包括黨、政、工、團)的安全生產職責,縱向到底是指從上到下所有安全管理人員的安全生產職責

穿孔作業鉆機穩車時千斤頂下面()

塌陷區應設置明顯標志,嚴禁人、牲畜、機械設備等進入

企業開展應急演習的過程可分為演習準備、演習實施和()三個階段

金屬非金屬礦山安全標準化系統的建設,應注重科學性、規范性和系統性,立足于危險源辨識和風險評價,充分體現風險管理和事故預防的思想,并與企業其他方面的管理有機結合

熱門試題 更多>
試題分類: 統計從業資格
練習次數:0次
試題分類: 口語
練習次數:0次
試題分類: 寫作
練習次數:0次
試題分類: 口語
練習次數:0次
試題分類: 理論與實務
練習次數:0次
試題分類: 初級(口語)
練習次數:0次
1.Thefailureofahigh-profilecholesteroldrughasthrownaspotlightonthecomplicatedmachinerythatregulatescholesterollevels.Butmanyresearchersremainconfidentthatdrugstoboostlevelsof'good'cholesterolarestilloneofthemostpromisingmeanstocombatspirallingheartdisease. 2.DrugcompanyPfizerannouncedon2Decemberthatitwascancellingallclinicaltrialsoftorcetrapib,adrugdesignedtoraiseheart-protectivehigh-densitylipoproteins(HDLs).Inatrialof15000patients,asafetyboardfoundthatmorepeoplediedorsufferedcardiovascularproblemsaftertakingthedrugplusacholesterol-loweringstatinthanthoseinacontrolgroupwhotookthestatinalone. 3.Thenewscameasakickintheteethtomanycardiologistsbecauseearliertestsinanimalsandpeoplesuggesteditwouldlowerratesofcardiovasculardisease."Therehavebeennoredflagstomyknowledge,"saysJohnChapman,aspecialistinlipoproteinsandatherosclerosisattheNationalInstituteforHealthandMedicalResearch(INSERM)inPariswhohasalsostudiedtorcetrapib."Thiscancellationcameasacompleteshock." 4.TorcetrapibisoneofthemostadvancedofanewbreedofdrugsdesignedtoraiselevelsofHDLs,whichferrycholesteroloutofartery-cloggingplaquestotheliverforremovalfromthebody.Specifically,torcetrapibblocksaproteincalledcholesterolestertransferprotein(CETP),whichnormallytransfersthecholesterolfromhigh-densitylipoproteinstolowdensity,plaque-promotingones.Statins,incontrast,mainlyworkbyloweringthe'bad'low-densitylipoproteins. Underpressure 5.Researchersarenowtryingtoworkoutwhyandhowthedrugbackfired,somethingthatwillnotbecomeclearuntiltheclinicaldetailsarereleasedbyPfizer.Onehintliesinevidencefromearliertrialsthatitslightlyraisesbloodpressureinsomepatients.Itwasthoughtthatthismildproblemwouldbeoffsetbytheheartbenefitsofthedrug.Butitispossiblethatitactuallyprovedfatalinsomepatientswhoalreadysufferedhighbloodpressure.Ifbloodpressureistheexplanation,itwouldactuallybegoodnewsfordrugdevelopersbecauseitsuggeststhattheproblemsarespecifictothiscompound.OtherprototypedrugsthatarebeingdevelopedtoblockCETPworkinaslightlydifferentwayandmightnotsufferthesamedownfall. 6.ButitisalsopossiblethatthewholeideaofblockingCETPisflawed,saysMotiKashyap,whodirectsatherosclerosisresearchattheVAMedicalCenterinLongBeach,California.WhenHDLsexcretecholesterolintheliver,theyactuallyrelyonLDLsforpartofthisprocess.SoinhibitingCETP,whichpreventsthetransferofcholesterolfromHDLtoLDL,mightactuallycauseanabnormalandirreversibleaccumulationofcholesterolinthebody."You'reblockingaphysiologicmechanismtoeliminatecholesterolandeffectivelyconstipatingthepathway,"saysKashyap.Goingup 7.Mostresearchersremainconfidentthatelevatinghighdensitylipoproteinslevelsbyonemeansoranotherisoneofthebestroutesforhelpingheartdiseasepatients.ButHDLsarecomplexandnotentirelyunderstood.Oneapproveddrug,calledniacin,isknowntobothraiseHDLandreducecardiovascularriskbutalsocausesanunpleasantsensationofheatandtingling.Researchersareexploringwhethertheycanbypassthissideeffectandwhetherniacincanlowerdiseaseriskmorethanstatinsalone.Scientistsarealsoworkingonseveralothermeanstobumpuphigh-densitylipoproteinsby,forexample,introducingsyntheticHDLs."Theonlythingweknowisdeadinthewateristorcetrapib,notthewholeideaofraisingHDL,"saysMichaelMiller,directorofpreventivecardiologyattheUniversityofMarylandMedicalCenter,Baltimore. Questions7-13 Matchtorcetrapib,HDLs,statinandCETPwiththeirfunctions(Questions8-13)..WritethecorrectletterA,B,CorDinboxes8-13onyouranswersheet.NBYoumayuseanylettermorethanonce. 7.Ithasbeenadministeredtoover10,000subjectsinaclinicaltrial. 8.Itcouldhelpridhumanbodyofcholesterol. 9.Researchersareyettofindmoreaboutit. 10.Itwasusedtoreducethelevelofcholesterol. 11.AccordingtoKashyap,itmightleadtounwantedresultifit'sblocked. 12.Itproducedcontradictoryresultsindifferenttrials. 13.ItcouldinhibitLDLs.Listofchoices A.TorcetrapicB.HDLSC.StatinD.CETP
試題分類: 閱讀
練習次數:2次
掃一掃,手機做題