不同季节对输煤系统的运行有何影响？
不同的季节对输煤系统的影响是不一样的，各有其特点。
⑴冬季煤仓易棚煤，影响机组出力，皮带及滚筒易粘煤，造成皮带打滑及跑偏事故（指北方及西北部） 。
⑵春、秋季雨水较频繁，露天的电气设备应防止雨水进入，引起设备损坏。
⑶夏季环境温度较高，所以值班人员应注意设备的温升，严防设备过热损坏。
暂无解析
关于问诊中现病史的询问不包括
Passage4
Questions16to20arebasedonthefollowingpassage:
Successfulinnovationshavedrivenmanyoldertechnologiestoextinctionandhaveresultedinhigherproductivity,greaterconsumptionofenergy,increaseddemandofrawmaterials,acceleratedflowofmaterialsthroughtheeconomyandincreasedquantitiesofmetalsandothersubstancesinuseeachperson.Thehistoryofindustrialdevelopmentaboundswithexamples.
In1870,horsesandmulesweretheprimesourceofpoweronU.S.farms.Onehorseormulewasrequiredtosupportfourhumanbeingsaratiothatremainedalmostconstantformanydecades.Atthattime,hadanationalcommissionbeenaskedtoforecastthepopulationfor1970,itsanswerprobablywouldhavedependedonwhetheritsconsultantswereofaneconomicortechnologicalturnofmind.Hadtheybeen“economists”,theywouldprobablyhaveprojectedthe1970horsesormulepopulationtobemorethan50million.Hadtheybeen“technologists”,theywouldhaverecognizedthatthepowerofsteamhadalreadybeenharnessedtoindustryandtolearnandoceantransport.Theywouldhaverecognizedfurtherthatitwouldbetheprimesourceofpoweronthefarm.Itwouldhavebeendifficultforthemtoavoidtheconclusionthatthehorseandmulepopulationwoulddeclinerapidly.
16.Accordingtothepassage,whatsuppliedmostofthepoweronU.S.farmsin1870?
A.AnimalsB.HumansC.EnginesD.Water
17.WhichofthefollowingisNOTmentionedbytheauthorasaconsequenceofnewtechnologicaldevelopments?
A.Oldertechnologiesdieaway.
B.ThequalityoflifeisImproved.
C.Overallproductivityincrease.
D.Morerawmaterialsbecomenecessary.
18.Itcanbeinferredfromthepassagethatby1870.
A.technologybegantobemoreeconomical
B.thesteamenginehadbeeninvented
C.theU.S.horsepopulationwasabout10million
D.anationalcommissionwasabout10million
19.Inthesecondparagraph,theauthorsuggeststhat“economists”would.
A.plantheeconomythroughyearlyforecasts
B.failtoconsidertheinfluenceoftechnologicalinnovation
C.valuetheeconomiccontributionoffarmanimals
D.consultthenationalcommissionontheeconomy
20.Whatistheauthor’sattitudetowardchangesbroughtonbytechnologicalinnovations?
A.Heisexcitedaboutthem.
B.Heacceptthemasnatural.
C.Heisdisturbedbythem.
D.Hequestionstheirusefulness.
Thissickmanwas_____inablanket.
Ifyourcar_____anyattentionduringthefirst12months,takeittoauthorizeddealer.
PartIIICloze
Directions:Therearetwentyblanksinthefollowingpassage.Foreachblanktherearefourchoices.ChoosetheonethatbestfitsintothepassageandthenmarksyouranswerontheAnswerSheet.
Whatmakesachildspeakalanguagehaslongbeenapuzzletolinguists.61speaking,therearetwoschoolsoflinguists,bothofwhomtrytoexplain62achildpicksupalanguagesoeasily.Thefactthatachildpicksalanguage63is64:Atoneyearold,achildisabletosay“bye-bye”;attwo,heisabletousefifty;bytherehebeginsto65tenses.ThefamousAmericanlinguistNoamChomsky66thathumanbeinghaveasortofbuilt-insystemforlanguageuse,andthatthe67is68.Childrenarenottaughtlanguage69theyaretaughtarithmetic.Otherlinguists,70,holdtheviewthatachildlearns71ofhislanguagefromthehintsintheenvironment.72,theoristsofbothschools73thatthereisabiologicalbasisforlanguageuse.The74iswhichismoreimportant,theinnerabilityortheenvironment.Thisiscertainlyafield75tobeexplored.Researchersfrombothschoolsarebusyfindingevidenceto76theirowntheory,but77sideispersuadingtheother.
Itseemsthatinorderto78whyachildlearnsalanguagesoeasily,wehaveto79thejointeffortsofbothschools.Somelinguist,likeDeVilliers,hasrecognizedthevalueofcooperation,and80linguistsofbothsidestoworktogether.
61.A.SurprisinglyB.PersonallyC.ProperlyD.Roughly
62.A.thatB.whenC.whyD.how
63.A.independentlyB.naturallyC.withouthelpD.withease
64.A.confusingB.surprisingC.questionedD.suspected
65.A.masterB.studyC.haveD.get
66.A.doubtsB.believesC.realizesD.criticizes
67.A.helpB.teacherC.environmentD.hint
68.A.quiteessentialB.veryimportantC.notnecessaryD.onlysecondary
69.A.asB.forC.whenD.though
70.A.inparticularB.asaresultC.howeverD.therefore
71.A.alittleB.someC.nothingD.most
72.A.BeforeB.FromnowonC.JustnowD.Bynow
73.A.suspectB.disagreeC.agreeD.realize
74.A.caseB.argumentC.problemD.question
75.A.waitingB.planningC.neverD.unlikely
76.A.provideB.createC.supplyD.support
77.A.notaB.oneC.neitherD.either
78.A.findoutB.ruleoutC.searchforD.lookfor
79.A.getridofB.trustinC.relyonD.persistin
80.A.orderedB.criticizedC.challengedD.urged
