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1、awos题库基础知识部分(选择题)（ThebasicknowledgepartofAWOSitembank(multiple-choicequestions)）Questioncontent:meteorologicalautomaticobservationtestquestions(178part2007-3-23ofmultiple-choicequestions)Choicequestions(1),fillintheblanks(2),judgmentquestions(3),questionsandanswers(5).Easy1,medium2,difficul
2、t3.Thebinarynumber00100100and00010100andis________.A)00110200B)00111000C)10001000D)01000100BOneOneSixteenhexadecimalnumberDCisconvertedtoabinarynumberis________.A)11001100B)10001001C)11011100D)11101110COneOneXandYasalogicalvariable,X=10111001,Y=11110011,logicaloroperationonthelogicvariablei
3、stheresultof________.A)11111011B)10111111C)11110111D)11111110AOneOneThefollowingstatementaboutsemiconductor,incorrectis________.A)semiconductorisasubstancethatguideselectricalcapacitybetweenconductorsandinsulatorsB)siliconandgermaniumarethemostcommonlyusedsemiconductormaterialsatpresentC)fr
4、eeelectronsandholesappearinpairsD)theresistivityisgreatlyimprovedbydopingtraceimpuritiesintotheintrinsicsemiconductorDOneTwoThefollowingnumbernumber,theminimumnumberis________.A)binary101100B)octal54C)decimal44D)sixteenhexadecimal2ADOneTwoThefollowingstatementiscorrect________.WhenAisXOR,th
5、etwovariableis"0",andtheresultis"1""B)thenon-operationisthetwo-elementoperatorC)alllogicaloperationsarebitwiseoperations(D)theresultof"sum"of16Hand16Dis24HCOneTwoIstheuseofazenerdiodePNjunction________.(A)unidirectionalconductivityB)reversebreakdowncharacteristicC)reversecharacteristicD)ion
6、diffusionBOneTwoBelowontheamplifiertosay,only________iscertainlycorrect.A)amplifierhaspoweramplificationfunctionB)amplifierhasvoltageamplificationfunctionC)amplifierhascurrentamplificationfunctionD)thegainbandwidthproductoftheamplifierisconstantAOneTwoThefollowingstatement,whichoneiswrong__
7、______.(A)whensomeonefindsanelectricshock,thepowershouldbecutofffirstB)themorehumidtheelectricalequipmentis,thelowerthesafevoltagewillbeused(C)inthesamepowersupplysystem,allowingsomeelectricalequipmenttousezeroprotection,andtheotherpartoftheuseofgroundpr
