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问题 问答题 简答题

什么是纺丝流体的可纺性？

答案

参考答案：

①可纺性是指流体承受稳定的拉伸操作所具有的形变能力；

②也即流体在拉伸作用下形成连续细长丝条的能力；

③可纺性是作为成纤高聚物的必要条件，但不一定是充分条件。

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     School education(教育) is very important and useful. Yet no one can l  1   everything at school and a

teacher can't teach his students e  2   they want to know. His job is to s  3   his students how to learn. He

teaches them how to read and how to think. So the students can learn much more by t  4  .

     It is more i  5      to know how to study by  oneself.  It's quite easy to learn something, but it's difficult

to u  6   it to solve problems. Great inventors  do  not get everything from school, but they still can invent

many things and change the world a l  7  .

     How can the inventors do all of this? That's b  8      they know how to  study. A lot of things are not

taught in the classroom. They   get a lot of knowledge by reading o  9     school. They  work  hard  and

never g  10   up all their lives.

1. l         2.e         3. s         4.t         5. i          

6. u             7.l           8.b         9.o         10.g          
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单项选择题

制动性能包括（）和制动效能。

A.制动效能的恒定性

B.车轮不滑移

C.行驶不跑偏
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