高频振荡器中采用的石英晶体具有压电效应，当外加电压的频率与石英切片的固有谐振频率相同时，机械振荡的振幅就剧烈增加， 通过石英切片的有功电流分量也随之大大增加，从而引起共振
1、正确正确
暂无解析
Nutritiousrefreshment
Aworkingfireextinguisher
WhichjobisIsabelgoingtoapplyfor?
Locateacontract
TroublewithTeamwork
MaryOwenexaminestheroleandefficiencyofteams
Recruiterssaythatcandidateswhocangiveexamplesofworktheyhavedoneasmembersofasuccessfulteamareinasstrongapositionasthosewhocanpointtosignificantindividualachievement.Indeed,toomuchofthelattermaysuggestthatthepersonconcernedisnota'teamplayer'-oneofthemoreseriousfailingsinthebookofmanagement.
Theimportanceofbeingateamplayerisasideeffectoftheincreasinginteractionacrossdepartmentsandfunctionaldivides.Insteadofpushingreports,paperworkanddecisionsaroundtheorganisation,'teamsprovideadynamicmeetingplacewhereideascanbesharedandexpertisemorecarefullytargetedatimportantbusinessissues,'saysSteveGardner,inhisbookKeyManagementConcepts.Headds,'Globalisationhasaddedafurtherdimensiontoteamwork.Multinationalteamsnowstudypolicydecisionsinthelightoftheirimpactonthelocalmarket.'
Butisteamworkingbeingoverdone?'Somemanagersareonasmanyassevenoreightdifferentteams',saysDrCathyBandy,apsychologistwhorecentlyranaconferenceonthesubject.'Theytakeupsomuchtimethatmanagerscan'tgetonwithcoretasks.'Formingteamsandhavingmeetingshas,shesays,becomeanendinitself,almostregardlessofpurpose.Thereisalsothedangerofanunhealthydesiretokeeptheteamgoingaftertheworkhasbeendone.'Peoplefeeltheneedtobelong,andteammembershipcanprovideakindofpsychologicalsupport.'
Theideabehindteamworkingisthat,whentherightgroupofpeopleisbroughttogether,a'force'developswhichisgreaterthanthesumoftheirindividualtalents.Thisisoftentrueinsport,wheregoodplayerscanreachunexpectedheightsasmembersofaninternationalteam.However,fewbusinesssituationshaveasclearasetofobjectives,orasclearcriteriaofsuccessorfailure,aswinningamatch.
'Inbusiness,everyoneneedstobeclearaboutwhatthechallengeisandwhetherateamistherightwayofapproachingit',saysSteveGardner.'Unfortunately,peoplefocusinsteadonwhothemembersoftheteamshouldbeandwhatrolestheyaretoplay'DrBandyagrees.'Thereisalwaysadangerthatteamscanturnintocommittees,'shesays.'Inalotofsituations,oneortwoindividualswouldbemuchmoreeffective.'
Sowhatmakesasuccessfulteam?Therearesomegeneralqualitiesthathavebeenidentified.SteveGardnerrecommendsthatineveryteamthereshouldbesomeonewhoisgoodatresearchingideasandanotherwhoisgoodatshootingdownimpracticalones.Thereshouldbethosewhocanresolvethetensionsthatnaturallyoccurinateamandotherswhoarefocusedongettingthejobdone.Also,providingaclearandachievabletargetattheoutsetisthebestwayofensuringthattheteamwillmoveontogreaterthings.
13、Whatpointdoesthewritermakeaboutteamworkingatthebeginningofthearticle?
AItisthemostsuccessfulformofmanagement.
BIthaschangedtherecruitmentprocedureincompanies.
CWell-runteamsstillallowindividualstodemonstratetheirtalents.
DBeingateamplayerisnowconsideredanessentialmanagementskill.
14、Accordingtothearticle,teamworkdevelopedwithincompaniesasaresponseto
Amodernofficedesign.
Bchangingworkpractices.
Careductioninadministrativetasks.
Dtheexpansionofinternationalbusiness.
15、Inthethirdparagraph,DrBandysuggeststhat
Amanyemployeesdonotenjoyworkinginteams.
Bsomemanagersarenotveryeffectiveteamleaders.
Csometeamsarecreatedunnecessarily.
Dfewteamsarewellorganised.
16、Accordingtothewriter,teamworkismoreeffectiveinthefieldofsportbecausetheplayers
Aknowwhattheywanttoachieve.
Baremorecompetitivebynature.
Chavemoreindividualtalent.
Dcanbedrivenbynationalpride.
17、SteveGardnerandDrBandyagreethatwhenabusinessteamiscreatedpeopledonotpayenoughattentionto
Athestructureoftheteam.
Balternativestotheteam.
Cselectingtheteammembers.
Ddirectingtheteam'sactivities.
18、WhatisSteveGardner'sadviceonoperatingasuccessfulteam?
AMaintainaflexibleapproachtomembership.
BAllowpersonalitiestodevelopwithintheteam.
CSelectpeoplewhofitnaturallyintocertainroles.
DMakeeveryefforttoavoidconflictbetweenmembers.
