[单项选择]下面哪种机械通气模式是"定容"型通气（）
A. 压力辅助通气P-ACV
B. 压力支持通气PSV
C. 同步间歇指令通气SIMV
D. 压力控制-同步间歇指令通气PC-SIMV
E. 压力控别通气PCV

在像居里夫人这样一位崇高人物结束她的一生的时候，我们不要仅仅满足于回忆她的工作成果对人类已经作出的贡献。第一流人物对于时代和历史进程的意义，在其道德品质方面，也许比单纯的才智成就方面还要大。即使是后者，它们取决于品格的程度，也远超过通常所认为的那样。 我幸运的同居里夫人有二十年崇高而真挚的友谊。我对她的人格伟大愈来愈感到钦佩。她的坚强，她的意志的纯洁，她的律己之严，她的客观，她的公正不阿的判断——所有的这一切都难得地集中在一个人的身上。她在任何时候都意识到自己是社会的公仆，她的极端的谦虚，永远不给自己留下任何余地。由于社会的严酷和不平等，她的心情总是抑郁的。这就使得她具有那样严肃的外貌，很容易使那些不接近她的人发生误解——这是一种无法用任何艺术气质来解晓的少见的严肃性。一旦她认识到某一条道路是正确的，她就毫不妥协地并极端顽强地坚持下去。 她一生中最伟大的科学功绩——证明放射性元素的存在并把它们分离出来——所以能取得，不仅是靠着大胆的直觉，而且也靠着在难以想象的极端困难情况下工作的热情和无比的顽强，这样的困难，在实验科学的历史中是罕见的。 居里夫人的品德力量和热忱，哪怕只要有一小部分存在于欧洲的知识分子中间，欧洲就会面临一个比较光明的未来。

Careful and careless are as different as fire and water. But strangely enough many scientists have both these qualities, that is, they are both careful and careless. Newton, the famous English scientist, was such a person.
Once Newton invited a friend to a dinner at home. When they were ready to eat, Newton still didn’t come back. Finally his friend found Newton in his lab. The reason was that when Newton was going to get the bottle of wine, he suddenly had a new idea for the experiment he was doing, so he completely forgot his friend and the dinner. There was another time when Newton was leading a horse up a mountain, holding the rein (缰绳) in his hand. While he was walking, he kept thinking of problems he had met in his studies. When he got to the top of the mountain he found that the rein was not in his hand and that the horse was gone.
Among scientists, there are many people like Newton. Einstein was one. Once he was waiting for a friend at a brid
A. as same as fire and water
B. as different as dark and bright
C. as different as fire and water
D. as same as black and white