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Conversation 2

A. Mentaldiseases.
B. Sleepproblems.
C. Highbloodpressure.
D. Heartproblems.

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Conversation 2

A. Ithelpstrainthelungstoworkhardforalongertime.
B. Ithelpsincreasethemuscles'sizeandstrength.
C. Ithelpsmaketheheartstrongandworkhard.
D. Ithelpskeepmuscleslongandsupple.

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Conversation 2

A. Itcantrainthehearttoworkhardforalongertime.
B. Itcanincreasemuscles'sizeandstrengtheventually.
C. Itcanonlyhelppeoplegetenormousandbeautifulmuscles.
D. Itcanmakebacktroublecompletelydisappear.

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A. Itisjustaboutanyamountofphysicalactivitythatimprovesfitness.
B. Itisjustanythingthatyouneedtoexertyourselftodotoburncalories.
C. Itmeansallformsofvigorousactivitiesordeliberateworkouts.
D. Itincludeseveryexercisewhichkeepsyourmusclestightandstrong.

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关于每次抽样的实际抽样误差，下列说法正确的是（）

A. 它可以计算
B. 它是估计量的标准差
C. 它是随机变量
D. 它是抽样极限误差

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Conversation 2

A. Mentaldiseases. B. Sleepproblems. C. Highbloodpressure. D. Heartproblems.

Conversation 2

Conversation 2

Conversation 2

关于每次抽样的实际抽样误差，下列说法正确的是（ ）

A. Mentaldiseases.
B. Sleepproblems.
C. Highbloodpressure.
D. Heartproblems.

关于每次抽样的实际抽样误差，下列说法正确的是（）