问题 单项选择题 A1/A2型题

血液流变学中,血液()

A.属于牛顿流体

B.属于非牛顿流体

C.血液黏度的变化与其切变率无关

D.低切变率下,全血黏度低

E.高切变率下,全血黏度高

答案

参考答案:B

解析:作为一个整体,全血是一种非牛顿流体,这种流体的表观黏度随切变率的改变而改变,血液的非牛顿特性在低切变率下表现得最为显著,在相同红细胞比容的条件下,低切变速率下,全血黏度高,在高切变速率下,全血黏度低。当液体的表观黏度不随切变率的变化而变化时,这种液体称为牛顿流体,比如血浆和水。

填空题

阅读下面短文,用括号内所给动词的适当形式填空,必要时可加助动词或情态动词。

     Jack's father was ill and wanted 1______ (eat) a goose (鹅). He had to go to town to buy one. As the

town was far, when he 2______ (walk) home, it was dark. He put the goose into the garden and 3______

(cook) it the next day. But someone stole (偷) it at night. He found there 4______ (be) only some feathers

(羽毛) near the river. The poor man was sad and went to the judge (法官) and told him about it.

     "5______ anyone ______ (see) the goose last night?" asked the judge. "Yes, sir," said Jack. "Fred saw

it in my garden." "Where 6______ he ______ (live)?" "Between my house and the river." "I see." The judge

went to the village with Jack. In the village the judge called Fred and other persons who lived not far from

Jack's house together. He said. "Jack bought a goose for his father who Was ill in bed yesterday. But it was

gone. Who stole it?" Nobody answered. "And who saw it last night?" Nobody answered. "And who saw it

last night?" Nobody answered, either.

     "I 7 already 7______ (know) who stole the goose," the judge said angrily and looked at them carefully.

Suddenly he shouted," 8______ (look)! There's a piece of goose feather on the thief's head!" All the persons

in the room looked at each other in surprise. Fred couldn't help 9______ (touch 触摸) his head. All the people

in the room10______ (begin) to laugh and Fred's face turned red.

单项选择题