问题 问答题

在生活中,我们有时因为生病而需要打针输液.图为输液示意图,药瓶瓶口插有两根管子.其中C管的作用是利用______使药液从A管中顺利流出;针头的表面做得非常光滑,这是为了______以减轻病人的痛苦.若要提高输液速度,除了调节调节器外,还有一个简便的方法就是______.

答案

因为输液时,如果没有C管,外部压强大于瓶内压强时,液体就无法输入到人体中,所以C管是利用大气压使药液从A管顺利流出的;

接触面越光滑,摩擦力越小,针头做得非常光滑,扎针时可以减小针头与血管之间的摩擦,以减轻病人的痛苦;

为了是药液顺利流入人体内,可以提高药瓶的高度,即增大液体对人体的压强.

故答案为:大气压,减小摩擦,提高药瓶的高度.

阅读理解

Long ago ,there lived in Greece a learned man. He was so well known for his good knowledge of almost everything that lots of people from all over the country came to learn from him. The great man taught his students whole-heartedly and answered their questions with great patience.

One day a student asked him, “ My dear teacher, didn’t you say you yourself have many ,many more questions about things than we do? But I think we students have far more than you.”

With a smile on his face, the teacher drew two circles ,one as large as a big cake, the other smaller. Then he said , “Of course, I have learned much more. But it’s wrong to think that a teacher has fewer questions than his students. Now, look at these two circles. The inside of the bigger one is my knowledge of things, and the inside of the smaller one is yours. Out of the circles is what is still unknown to us. Since mine is larger, I have to use the longer line to draw the bigger circle. That means I have more opportunities to face what is still unknown. And that’s why I myself have more questions than you do. The more you learn , the more questions you have. You will never learn enough ,you know.”

小题1:The learned man drew two circles to show _____.

A.he was good at drawing circles

B.his knowledge had something to do with the circles

C.why he had more questions than the students

D.how he could get more knowledge小题2:The student didn’t agree that ______.

A.the teacher had so many questions as a learned man

B.the teacher had so many questions

C.the students had fewer questions than the teacher

D.the students had more questions than 0the teacher小题3:The teacher was famous for his ______.

A.kindness

B.knowledge

C.patience

D.questions小题4:From the passage we can learn that_____.

A.the more questions we have, the more knowledge we may get

B.it’s never too old to learn

C.every one of us should try to be a learned man

D.a teacher should have many questions小题5:Which of the following shows us what the teacher drew?

问答题 简答题