热力膨胀阀是蒸汽压缩式制冷与热泵机组常用的节液装量。关于热力膨胀阀流量特性的描述，下列哪个选项是正确的?（）
A、热力膨胀阀如果选型过大，容易出现频紧启闭（震荡）现象A
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Shehiredalawyertoinvestigate,onlytolearnthatGabrielhadremovedhernamefromthedeed.Theinfinitiveverbphrase“onlytolearn”isused____.
TEXTD
Personalityis，tolargeextent,inherent--A-typeparentsusuallybringaboutA-typeoffspring.Butthe
environmentmustalsohaveaprofoundeffect,sinceifcompetitionisimprotanttotheparents,itislikelytobecomeamajorfactorlivesoftheirchildren.OneplacewherechildrensoakupAcharacteristicsisschool,whichis,byitsverynature,ahighlycompetitiveinstitution.Toomanyschoolsadoptthe"winatallcosts"moralstandardandmeasuretheirsuccessbysportingachievements.Thecurrentpassionformakingchildrencompeteagainsttheirclassmatesoragainsttheclockproducesatwo-layersystem,inwhichcompetitiveAtypesseeminsomewaybetterthantheirB-typefellows.Beingtookeentowincanhavedangerousconsequences:rememberthatPheidippides,thefirstmarathonrunner,droppeddeadsecondsaftersaying:"Rejoice,weconquer!".Byfartheworstformofcompetitioninschoolisthedisproportionateemphasisonexaminations.Itisarareschoolthatallowspupilstoconcentrateonthosethingstheydowell.Themeritsofcompetitionbyexaminationaresomewhatquestionable,butcompetitioninthecertainknowledgeoffailureispositivelyharmful.Obviously,itisneitherpracticalnordesirablethatallAyoungsterschangeinto'B's.Thewouldneedstypes,andschoolshaveanimportantdutytotrytofitachild'spersonalitytohispossiblefutureemployment.Itistopmanagement.16.Accordingtotheauthor,whatfactorscontributetothebuildingofpersonality?
A.inheritance
b.inheritance,competitionandenvironment
c.competition
d.environment
17.Whichofthefollowingstatementsisnottrueaccordingtotheauthorofthepassage?
A.Schoolsusuallyadoptseverecompetitivepolicies.
B.Studentsareoftendividedbycompetitionresults.
C.Schoolisplacewherechildrencultivatetheircharacteristics.
D.Thestrongerdesireforwinning,thebetter.
18.Thephrase"soakup"isclosestinmeaningto____.
A.pullup
b.takeup
c.takein
d.pullin
19.Whatattitudedoestheauthorholdtowardexaminationsinschools?
A.positive
b.negative
c.doubtful
d.neutral
20.whatsuggestiondoestheauthormakeconcerningthemanagementofschools?
A.AllstudentsbemadeintocompetitiveAtypes.
B.Achild'spersonalitybeconsideredinregardtohispossiblefuturejob.
C.AllstudentsbechangedintoBcharacteristics.
D.Schoolsabolishallformsofexaminations.
Mrs.Whitehas_____thatsheisnotabletogetajob.
Thefirststepinthestudyofanylanguageisobservingand____preciselywhathappenswhennativespeakersspeakit.
U.S.News____________rankingsofcollegessince1983.Theyareaverypopularresourceforstudentslookingtoapplytouniversitycampus.
