转速负反馈系统中,负载转矩增加,则电动机转速 ()

A、不变
B、下降
C、上升
D、上升或下降
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正确答案:

B

答案解析:

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TEXTB

Whatweknowofprenataldevelopmentmakesallthisattemptmadebyamothertomoldthecharacterofherunbornchildbystudyingpoetry,art,ormathematicsduringpregnancyseemutterlyimpossible.Howcould

suchextremelycomplexinfluencespassfromthemothertothechild?Thereisnoconnectionbetweentheirnervoussystems.Eventhebloodvesselsofmotherandchilddonotjoindirectly.Anemotionalshocktothemotherwillaffectherchild,becauseitchangestheactivityofherglandsandsothechemistryherblood.Anychemicalchangeinthemother'sbloodwillaffectthechildforbetterorworse.Butwecannotseehowalooking

formathematicsorpoeticgeniuscanbedissolvedinbloodandproduceasimilarlikingorgeniusinthechild.

Inourdiscussionofinstinctswesawthattherewasreasontobelievethatwhateverweinheritmustbeof

someverysimplesortratherthananycomplicatedorverydefinitekindofbehavior.Itiscertainthatnoone

inheritsaknowledgeofmathematics.Itmaybe,however,thatchildreninheritmoreorlessofarathergeneral

abilitythatwemaycallintelligence.Ifveryintelligentchildrenbecomedeeplyinterestedinmathematics,they

willprobablymakeasuccessofthatstudy.

Asformusicalability,itmaybethatwhatisinheritedisanespeciallysensitiveear,apeculiarstructureofthe

handsorthevocalorgansconnectionsbetweennervesandmusclesthatmakeitcomparativelyeasytolearnthe

movementsamusicianmustexecute,andparticularlyvigorousemotions.Ifthesefactorsareallorganized

aroundmusic,thechildmaybecomeamusician.Thesamefactors,inothercircumstancemightbeorganized

aboutsomeothercenterofinterest.Therichemotionalequipmentmightfindexpressioninpoetry.Thecapable

fingersmightdevelopskillinsurgery.Itisnottheknowledgeofmusicthatisinherited,thennoreventheloveof

it,butacertainbodilystructurethatmakesitcomparativelyeasytoacquiremusicalknowledgeandskill.

Whetherthatabilityshallbedirectedtowardmusicorsomeotherundertakingmaybedecidedentirelybyforces

intheenvironmentinwhichachildgrowsup.

6.Whichofthefollowingstatementsisnottrue?

A.Somemotherstrytoinfluencetheirunbornchildrenbystudyingartandothersubjectsduringtheir

pregnancy.

B.Itisutterlyimpossibleforustolearnanythingaboutprenataldevelopment.

C.Thebloodvesselsofmotherandchilddonotjoindirectly.

D.Therearenoconnectionbetweenmother'snervoussystemsandherunbornchild's.

7.Amotherwillaffectherunbornbabyontheconditionthat____.

A.sheisemotionallyshocked

B.shehasagoodknowledgeofinheritance

C.shetakespartinallkindofactivities

D.shestickstostudying

8.Accordingtothepassage,achildmayinherit____.

A.everythingfromhismotherB.aknowledgeofmathematics

C.arathergeneralabilitythatwecallintelligence

D.hermother'smusicalability

9.Ifachildinheritssomethingfromhismother,suchasanespeciallysensitiveear,apeculiarstructureofthe

handsorofthevocalorgans,hewill____.

A.surelybecomemusician

B.mostlybecomeapoet

C.possiblybecomeateacher

D.becomeamusicianontheconditionthatallthesefactorsareorganizedaroundmusic

10.Whichofthefollowingisthebesttitleforthepassage?

A.RoleofInheritance.

B.AnUnbornChild.

C.Functionofinstincts.

D.InheritedTalents.

GreatasNewtonwas,manyofhisideas____todayandarebeingmodifiedbytheworkofscientistsofourtime.

A、aretochallenge
B、maybechallenged
C、havebeenchallenged
D、arechallenging

Allofuswouldhaveenjoyedthepartymuchmoreifthere_____quitesuchacrowdofpeoplethere.

A、weren’t
B、hasn’tbeen
C、hadn’tbeen
D、willneed

___willMr.Forbesbeabletoregaincontrolofthecompany.

A、Withhardwork
B、Onlyifheworkshardly
C、Inspiteofhishardwork
D、Onlywithhardwork

Hewasluredintoacrimehewouldnot____________havecommitted.

A、actually
B、accidentally
C、otherwise
D、seldom
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