用下列句子前括号里单词的适当形式填空并翻译句子。1.（fair）"It's____！"Johncomplained.2.(end)I’mfedupwithyour____complaining.3.(close)Theliftingofthecurtain____abeautifulwinterscene.4.(appoint)Myparentswere_____withmebecauseIfailedtheexam.5.(spell)Thebookcontainsquiteafew_____words;theproof-readerreallyshouldhavebeenmorecareful.6.(understand)Don’t____hissi-lenceforlackofinterest;actuallyheisveryinterestedinthesubjectwearediscussingnow.7.(load)TheAmericanshiparrivedattheportyesterday,andworkersare_____itscontentsintheharbornow.8.(certain)Ihadalongtalkwithhimyesterday,butI’mstill_____abouthisintention.9.(regular)Thatyoungmotherdoesnotlike_____workinghours.10.(proper)Jokingwithotherpersonsatthisofficialcelebrationis_____behaviorforsuchaseriousoccasion.

用下列句子前括号里单词的适当形式填空并翻译句子。1.（fair）'It's____！'Johncomplained.2.(end)I’mfedupwithyour____complaining.3.(close)Theliftingofthecurtain____abeautifulwinterscene.4.(appoint)Myparentswere_____withmebecauseIfailedtheexam.5.(spell)Thebookcontainsquiteafew_____words;theproof-readerreallyshouldhavebeenmorecareful.6.(understand)Don’t____hissi-lenceforlackofinterest;actuallyheisveryinterestedinthesubjectwearediscussingnow.7.(load)TheAmericanshiparrivedattheportyesterday,andworkersare_____itscontentsintheharbornow.8.(certain)Ihadalongtalkwithhimyesterday,butI’mstill_____abouthisintention.9.(regular)Thatyoungmotherdoesnotlike_____workinghours.10.(proper)Jokingwithotherpersonsatthisofficialcelebrationis_____behaviorforsuchaseriousoccasion.

求解常微分方程组<img src="http://img1.ph.126.net/B8qMozAYz7oEzmWV3LBSvg==/6597340246519736485.png" />, 应用的语句是? DSolve[{x'[t]+y[t]==Cos[t],y'[t]+x[t]==Sin[t]},{x,y},t]|DSolve[{x'[t]+y[t]==Cos[t],y'[t]+x[t]==Sin[t]},x[t],y[t],t]|DSolve[{x'[t]+y[t]==Cos[t],y'[t]+x[t]==Sin[t]},{x[t],y[t]},t]|DSolve[x'[t]+y[t]=Cos[t],y'[t]+x[t]=Sin[t],{x[t],y[t]},t]

下述真值表表示的命题是。 Input Output p q r T T T T T T F F T F T T T F F T F T T T F T F T F F T T F F F T

图示系统的微分方程为（ ）[img=808x247]17de73b60010c18.png[/img] A: y''(t)+3y'(t)+2y(t)=4f'(t)+f(t) B: y''(t)+2y'(t)+3y(t)=4f'(t)+f(t) C: 4y'(t)+y(t)=f''(t)+3f'(t)+2f(t) D: y''(t)+3y'(t)+2y(t)=f'(t)+4f(t)

求微分方程[img=261x61]17da6536c0cca5d.png[/img]的通解； （ ） A: C18*cos(t) - C20*sin(t) - C19*t*cos(t) - C21*t*sin(t) B: C18*cos(t) + C20*sin(t) - C19*t*cos(t) - C21*t*sin(t) C: C18*cos(t) + C20*sin(t) + C19*t*cos(t) + C21*t*sin(t) D: -C18*cos(t) + C20*sin(t) + C19*t*cos(t) + C21*t*sin(t)

在t检验中，α水平上的否定域是： A: （－∞，tα]和[tα，＋∞） B: (- tα,＋tα) C: （－∞，tα]和(- tα,＋tα) D: [tα，＋∞）和(- tα,＋tα)

在（）温度范围内，玻璃态聚合物才具有典型的应力-应变曲线。 A: T﹤T﹤T B: T﹤T﹤T﹤T C: T﹤T﹤T﹤T

下列等式不成立的是_____。 A: f(t)δ’(t)=f(0)δ’(t) B: f(t)δ(t)=f(0)δ(t) C: f(t)*δ’(t)=f ’(t) D: f(t)*δ(t)=f(t)

下腹壁反射消失提示胸段脊髓损害位于（）。 A: T～T B: T～T C: T～T D: T～T E: T～T