什么是工艺纤维?
参考答案:
有些麻类纤维单纤维很短,不能采用单纤维纺纱,所以采用不完全脱胶工艺与剩余果胶粘合集束的束纤维作为纺纱用纤维,把这样的集束纤维称为工艺纤维。
用所给词的适当形式填空。
1. He is __________ (please) with his brother's performance in the school sports meeting.
2. Water __________ (pollute) is really serious because the poison is bad for the river.
3. She __________ (have) her supper with her parents when I got to her home.
4. When he knew the dog died, he left __________ (happy) without a word.
5. We can use knives __________ (cut) meat when we are doing some cooking.
6. He didn't believe their words, so he decided to have a look _________ (he).
7. Please take buses, cars and __________ (taxi) to travel from one place to another.
8. Whom __________ they __________ (study) with this time yesterday?
9. Grandma _________ (have) a bad cold since last Saturday.
10. If we don't protect the wetlands, it will be __________ (possible) to see these birds in the future.
先天性肌性斜颈的病因学说有
A.宫内学说
B.遗传学说
C.血运障碍学说
D.产伤学说
E.综合学说