题目内容

Fill in each of the following blanks with an appropriate word or phrase.Incollegeanduniversitycourse,theobjectivetestandtheessayexamaretwocontrastingmethodsofevaluationcommonlyusedtomeasureastudent’sgraspofsubjectmatter.Theobjectivetest1)_________consistsofalargenumberofunrelatedquestionsthatrequirethestudenttodemonstratemasteryofdetails.It2)_________leadtorotememorizationofisolatedfactsduringthepre-testperiodofstudy.3)_________thequestionsontheobjectivetestarepresentedinatrue-falseormultiple-choiceform,thestudentmaybeencouragedtoguessanswerstowhichhehasnoaccurateknowledgeabout.Theessayexam,4)________usuallyconsistsofafewbroadlystatedquestionsthatrequirethestudenttoorganizehisresponsesinanessay.Suchquestionsforcethestudenttogiveproofofhisabilitytohandlegeneralconcepts.Thistypeofexam5)_________reliesonfactualinformation,6)_________thereisfargreaternecessityforthestudenttodemonstrateanalyticalandcompositionalskills.Mereguessingatanswersisreducedtoaminimum.7)________theobjectivetestandtheessayexamhavesimilargoals—theassessmentofastudent'sacademicachievement—thetechniques(andveryoftentheresults)ofthetwotypesofexaminationsdiffersignificantly.

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属于模拟信号的是( )。

A. 抽样后的PAM信号
B. 量化后的PAM信号
C. 解码后的PAM信号
D. 编码后的PCM信号

根据抽样定理,对低通型模拟信号进行抽样的抽样频率fs与模拟信号的最高频率fm的关系是( )。

A. fs≤2fm
B. fs=2fm
C. fs〉2fm
D. fs≥2fm

A律13折线中第5段折线的斜率是( )。

A. 16
B. 4
C. 2
D. 1

对于-40dB的语音信号,采用A律13折线压缩特性进行非均匀量化时,信噪比的改善量是( )dB。

A. 24
B. 18
C. 12
D. 6

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