3． 画出模拟信号f（t)进行简单增量调制的调制器原理框图，并完成下列问题（判决器的抽样速率为fs，量化台阶为△)

Which of the following sentences is a COMMAND？

A．What noise you are making!

B．Never do that again!

C．Have a good time.

D．Beg your pardon.

Which of the following sentences is a COMMAND？

A．What noise you are making!

B．Never do that again!

C．Have a good time.

D．Beg your pardon.

Which of the following sentences contains an appositive clause？

A．It is no use crying over spilt milk.

B．It happened that we were all at home that day.

C．Where did you get the idea that I could not come？

D．Germany is, to be honest, the key to the integration of the EU.

Which of the following sentences is CORRECT？

A．What do you say that the population of Beijing is？

B．How many people do you think to stay here？

C．Who do you guess is singing？

D．What do you tell that is？

Which of the following sentences contains subjunctive mood？

A．The judge insisted that the accused man appear in person.

B．She used to drive to work, but now she takes the city metro.

C．Use your head, and then you"ll have an idea.

D．If a flood happened in the past, there was usually great loss of life and property.

Which of the following sentences is INCORRECT？

A．Fire and water do not agree.

B．Each minute and each second are valuable.

C．Bread and butter is a nutritious food for patients.

D．The scholar and poet is dead.

Which of the following sentences is a COMMAND？

A．Beg your pardon.

B．Have a good time.

C．Never do that again!

D．What noise you are making!

A、O my love is a red, red rose.

B、O my love is like a red, red rose.

C、The rose is a rose.

D、The rose is red.

Which of the following sentences contains subjunctive mood？(2013)

A．Lucy insisted that her son get home before 5 o"clock.

B．She used to drive to work, but now she takes the city metro.

C．Walk straight ahead, and don"t turn till the second traffic lights.

D．Paul will cancel his flight if he cannot get his visa by Friday.