当未吸附区消失时，可以认为吸附床出口排出的不再是清洁的气体了。

A、柳 开

B、石 介

C、范仲淹

D、欧阳修

A、作业控制块（JCB）

B、设备控制表（DCT）

C、控制器控制表（COCT）

D、通道控制表（CHCT）

A、被动操

B、抬头训练

C、翻身训练

D、学坐

A、1440 Pa

B、1600 Pa

C、1280 Pa

D、2080 Pa

A、50%

B、70%

C、80%

D、90%

1. Julius Caesar Nearly two thousand years ago there lived in Rome a man whose name was Julius Caesar. He was the greatest of all the Romans. Why was he so great? He was a brave warrior, and had conquered many countries for Rome. He was wise in planning and doing. He knew how to make men both love and fear him. At last he made himself the ruler of Rome. Some said he wished to become its king. But the Romans at that time did not believe in kings. Once when Caesar was passing through a little country village, all the men, women and children of the place came out to see him. There were not more than fifty of them, all together, and they were led by their mayor, who told each one what to do. These simple people stood by the roadside and watched Caesar pass. The mayor looked very proud and happy; for was he not the ruler of this village? He felt that he was almost as great as Caesar himself. Some of the ranking officers who were with Caesar laughed. They said, "See how that fellow struts at the head of his little flock!" "Laugh as you will." said Caesar, he has reason to be proud. "I would rather be the head man of a village than the second man in Rome!" At another time, Caesar was crossing a narrow sea in a boat. Before he was half way to the farther shore, a storm overtook him. The wind blew hard; the waves dashed high; the lightning flashed; the thunder rolled. It seemed every minute as though the boat would sink. The captain was in great fright. He had crossed the sea many times, but never in such a storm as this. He trembled with fear; he could not guide the boat; he fell down upon his knees; he moaned, "All is lost! All is lost!" But Caesar was not afraid. He bade the man get up and take his oars again. "Why should you be afraid?" he said."The boat will not be lost; for you have Caesar on board." 2.Why did the ranking officers laugh?

A、Because they were happy to see the villagers and the head man.

B、Because they were showing the mockery to the head man's pride

C、Because Caesar asked them to laugh.

D、Because they found the head man of the village interesting.