液压系统滑阀修后的粗糙度应不大于 Ra0.16。

1、正确
2、错误
查看答案
正确答案:

正确

答案解析:

暂无解析

上一题
你可能感兴趣的试题

下列哪项是胸外按压指征的正确描述?

人际关系的核心是

A、尊重
B、利益
C、创造
D、信任
E、发展

Passage2

Questions6to10arebasedonthefollowingpassage:

Inordertolearntobeone’strueself,itisnecessarytoobtainawideandextensiveknowledgeofwhathasbeensaidanddoneintheworld;criticallytoinquireintoit;carefullytoconsiderit;clearlytoanalyzeit;andearnestlytocarryitout.

Itmattersnotwhatyoulearn,butwhenyouoncelearnathing,youmustnevergiveitupuntilyouhavemasteredit.Itmattersnotwhatyouinquireinto,butwhenyouonceinquireintoathing,youmustnevergiveitupuntilyouhavethoroughlyunderstoodit.Itmattersnotwhatyoutrytothinkout,butwhenyouoncetrytothinkoutathing,youmustnevergiveitupuntilyouhavegotwhatyouwant.Itmattersnotwhatyoutrytocarryout,butwhenyouoncecarryoutathing,youmustnevergiveitupuntilyouhavedon’titthoroughlyandwell.

Ifanothermansucceedsbyoneeffort,youwilluseahundredefforts.Ifanothermansucceedsbytenefforts,youwilluseathousand.

6.Accordingtotheauthor,firstofallonemust.

A.analyzeB.inquireC.obtainknowledgeD.act

7.Accordingtotheauthor,.

A.learningisnotimportantB.thinkingisnotnecessary

C.knowledgemeanslittleD.itisnotimportantwhatwelearn

8.Theendoflearningshouldbe.

A.thoughtB.masteryC.inquiryD.analysis

9.Accordingtotheauthor,anotherman’ssuccessshould.

A.makegreatereffortsB.makeusnervous

C.notbetakenintoconsiderationD.causeonetostoptrying

10.Theauthorimpliesbutdoesnotsaywhat.

A.thewaytoknowledgeisthroughspecialization

B.onehastoknoweverythingtobesuccessful

C.successdependsnotsomuchonnaturalabilityasitdoesoneffort

D.successinone’sprofessionislatestimportantinone’slife

Passage4

Questions16to20arebasedonthefollowingpassage:

Thenewglobalsatellitecommunicationssystemswillofferthreekindsservice,whichmayoverlapinmanydifferentkindsofreceivers.

VOICE.SatellitetelephoneswillbeabletomakecallsfromanywhereontheEarthtoanywhereelse.Thatcouldmakethemespeciallyusefultoremote,thirdworldvillages(someofwhichalreadyusestationarysatellitetelephones),explorersanddisaster-reliefteams.Today’smobiletelephonesdependonearth-boundtransmitters,wheretechnicalstandardsvaryfromcountrytocountry.Sobusinesstravelerscannotusetheirmobilephonesoninternationaltrips.Satellitetelephoneswouldmakethatpossible.

MESSAGING.Satellitemassagershavethesameglobalcoverageassatellitetelephones,butcarrytextalone,whichcouldbeusefulforthosewithlaptopcomputers.Equippedwithasmallscreenliketoday’spapers,satellitemassagerswillalsoreceiveshortmessages.

TRACKING.Voiceandmessagingsystemswillalsotelltheiruserswheretheyaretowithinafewhundredmeters.Combinedwiththemessagingservice,thelocationservicecouldhelprescueteamstofindstrandedadventurers,thepolicetofindstolencars,exporterstofollowtheprogressofcargoes,andhaulagecompaniestocheckthatdriversarenotdetouringthepub.America’smilitaryGlobalPositioningSystem(GPS)satellitewillprovidebetterpositioninginformationtoanyonewhohasareceiverfortheirsignals,butGPSdoesnotcarrymessages,sosuchareceivercannotbeusedonitsownfortrackingorrescue.Bythemid-1990s,GPSreceiverswillbeabletotellpeoplewheretheyaretowithin70metersanywhereintheworld,andtowithinameterorsoinareaswheretheserviceissupplementedbyground-basedtransmitter.

16.Globalsatellitecommunicationssystemswillbeusefulto.

A.laptopcomputerusers

B.remotevillages

C.disaster-reliefteams

D.allabove

17.Satellitetelephonewillmake.

A.businesstravelersusemobilephonesoninternationaltrips

B.possiblecallsfromanywhereonearthtoanywhereelse

C.explorershappy

D.allabove

18.Whichofthefollowingistrue?

A.ThepositioningprecisionofthevoicesystemisbetterthanthatofGPS.

B.ThepositioningprecisionofGPSisBetterthanthatofthevoicesystem.

C.ThepositioningprecisionofthemessagingsystemisbetterthanofGPS.

D.Thepositioningprecisionofvoicesystemisbetterthanthatofthemessagingsystem.

19.Whatcanwesayaboutthenewglobalsatellitecommunicationssystems?

A.Theyarewidelyused.

B.Theyareveryhelpful.

C.Theyarecostly.

D.BothAandB.

20.Whichofthefollowingmaybethebesttitleforthepassage?

A.GlobalSatelliteCommunications

B.NewVoiceandMessagingSystem

C.NewGenerationSatellite

D.AlwaysinTouch

关于骨髓穿刺术的护理,不妥的是

A、穿刺部位为髂前上棘时,患者宜取侧卧位
B、嘱患者术后当天不要沐浴,保持局部干燥,避免感染
C、血友病、局部皮肤感染者禁忌
D、操作过程中密切观察患者的面色、呼吸、脉搏、血压,告诉患者勿动,以防穿刺针折断
E、拔针后局部加压,血小板减少者至少按压3~5分钟
热门试题 更多>
相关题库更多>
果树工
菌类园艺工
茶叶加工工
农机修理工
试卷库
试题库