15春福师《电子测量与仪器》在线作业二满分答案

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1、15春福师《电子测量与仪器》在线作业二满分答案^Electronicmeasurementandinstrumetheonlineworkofopeng15Examtime:100testtime:SingletopicselectionMultiplechoiceTrueorfalse(20questionsintotal,40points・)Thebasicunitsthatdonotbelongtotheinternationalunitofunitsare()・A.kendraKelvin(K)C.molesD.kmFullmark

2、s:2Thesamplingsignalmeans()・A.amplitudecontinuousanddiscretetimeB.TheamplitudeisdiscreteandtimeiscontinuousA.acontinuous,continuoustimeB.Amplitudediscrete,discretetimeFullmarks:2Highprecisioncrystaloscillatorinelectroniccounters,usuallytaken()・A.B.selectthecircuitelementC.

3、constanttemperatureortemperatureD.eliminateparasiticoscillationsFullmarks:2Thefrequencyofthemeasurementerrorcurveandtheintersectionofthemeasurederrorcurveiscalled()・IntersectionfrequencyCriticalfrequencyCenterfrequencyMediumfrequencyFullmarks:2Theinformationofthesubjectepi

4、stemologyismuchricherthantheobjectepistemologicalinformation・Notbecause()・A.thesubjectofcognitionhasimaginationB.thesubjectofcognitionhasthefeelingabilityC.thebodyofknowledgeiscapableofunderstandingThesubjectofcognitionhasapurposeFullmarks:2Thefollowingmethodsdonotreduceth

5、equantificationerror:()mv/word.A.ThefrequencyofthebaseishigherwhenthefrequencyismeasuredB.ThehighertimebasefrequenciesareusedduringtheweekC.adoptmulti-cyclemeasurementsD.adopttheaveragemethodFullmarks:2Whenthesamequantityismeasuredmultipletimesunderthesameconditions,theran

6、domerror()isdoubled.A.theabsolutevalueandthesignchangeTheabsolutevaluechanges,thesignremainsconstantThesignchanges,theabsolutevalueremainsconstantA.boththeabsolutevalueandthesymbolremainconstantFullmarks:2Themodulationdomaindescribesaflatdomainthatiscomposedof()・A.timeandm

7、agnitudeB.timeandfrequencyFrequencyandamplitudeD.TimeandphaseFullmarks:29.Acountermeasuredirectlyweeksofresolutionof1ms,iftheperiodmeasurementmethod,moredesiretoincreasetheresolutiontestweeksto0.1mus,shouldchoosethe"cycletimesby〃forthe()ofplanardomain・10A.10-4B.10-1C.104D.

8、Fullmarks:2ThefollowingitemsarenotpartofTobemeasuredA.measuringsystemMeasurementerrorMeas