AFT电路指的是（）电路。

A:自动亮度调节 B:自动频率微调 C:自动消色 D:自动色饱和度控制

电视机中，AFT电路的作用是（）

A:稳定本振频率 B:稳定图像载频 C:稳定伴音载频 D:稳定副载波频率

电视机的AFT开关置OFF位时，电视机能正常收看，置ON位时反而出现图像不稳定现象，故障的原因可能是（）。

A:调谐电压不稳 B:AFT电路失调 C:高频调谐器故障 D:预选时未能准确调谐

AFT信号可以用于（）。

A:稳定高频头的本振频率 B:制式识别信号 C:控制副载波频率 D:控制扫描频率 E:作为自动搜索过程中的捕捉信号

．AFT电路的组成包括（）。

A:视频检波器 B:图像中频放大器 C:90o移相器 D:低通滤波器 E:鉴相器

AFT电路有何作用？它是如何工作的？

He was (so) excited after hearing the news (and) he (could not) fall asleep (immediately).（　）

A:so B:and C:could not D:immediately

(It is) (important) that she (goes to) see the doctor (immediately).（　）

A:It is B:important C:goes to D:immediately

When all the people had assembled, the king, surrounded by his court, (21) a signal. Then a door beneath him opened, and the accused man stepped out into the arena. Directly opposite him were two doors, exactly (22) and side by side. It was the duty and the privilege of the person on trial to walk directly to these (23) and open one of them. He (24) open either door he pleased; he was subject to no guidance or influence but that of impartial and incorruptible chance. If he opened the one, there came out of it a hungry tiger, the fiercest and most cruel that could be found, which (25) sprang upon him and tore him to pieces as a punishment for his guilt. But, if the accused person opened the other door, out of it came a (26) lady, and to this lady he was immediately married, as a reward of his innocence. This was the (27) method of administering justice. Its perfect fairness is obvious. The criminal could (28) know out of which door would come the lady; he opened either he pleased, without having the slightest (29) whether, in the next instant, he was to be devoured or married. So the accused person was instantly (30) if guilty, and, if innocent, he was rewarded on the spot.

A:immediately B:usually C:sometimes D:frequently