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章节目录

单选题 It was _____ the chief engineer came _____ we began the experiment.

A

not until; that

B

not until; then

C

until; that

D

until; when

单选题 It was _____ she was sick _____ she didn’t come to attend the farewell party.

A

because; why

B

why; that

C

since; that

D

because; that

单选题 Written in central Canada in the early part of the twentieth century, _____, depicts life in Manitoda.

A

The Midnight Sun was Victor Frank’s last novel

B

Victor Frank’s last novel was The Midnight Sun

C

The Midnight Sun, which was Victor Frank’s last novel

D

Which was Victor Frank’s last novel, The Midnight Sun

单选题 已知某二阶非齐次线性微分方程的三个解分别为y1=ex,y2=xex,y3=x2ex,则它的通解为(  )。

A

y=C1(x-1)ex+C2(x2-1)ex+ex

B

y=C1(x-1)e-x+C2(x2-1)ex+ex

C

y=C1(x-1)ex+C2(x2-1)e-x+ex

D

y=C1(x-1)ex+C2(x2-1)ex+e-x

单选题 微分方程y″-2y′+2y=ex的通解为(  )。

A

y=ex(c1cosx+c2sinx)+ex

B

y=ex(c1cosx+c2sinx)-ex

C

y=ex(c1cosx-c2sinx)+ex

D

y=ex(c1cosx-c2sinx)-ex

单选题 一定量的理想气体,分别经历如图(a)所示的abc过程,(图中虚线ac为等温线),和图(b)所示的def过程(图中虚线df为绝热线)。判断这两种过程是吸热还是放热(  )。

A

abc过程吸热,def过程放热

B

abc过程放热,def过程吸热

C

abc过程和def过程都吸热

D

abc过程和def过程都放热

单选题 如图所示,一定量的理想气体,从p-V图上初态a经历(1)或(2)过程到达末态b,已知a、b两态处于同一条绝热线上(图中虚线是绝热线),则气体在(  )。

A

(1)过程中吸热,(2)过程中放热

B

(1)过程中放热,(2)过程中吸热

C

两种过程中都吸热

D

两种过程中都放热

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