问题
问答题 简答题
造纸车间纸料的净化和筛选的目的和作用是什么？
答案
参考答案：
净化和筛选的目的和作用
目的：
筛选的目的在于除掉纸浆中相对密度小二体积大的杂质，如浆团、纤维束、草屑等。
净化的目的在于除掉纸浆中相对密度大的杂质，如沙粒、金属屑、煤渣等。
作用：
（1）除去纸料中残余的杂质
（2）制成均匀分散的纤维悬浮液
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造纸车间纸料的净化和筛选的目的和作用是什么？
参考答案：
净化和筛选的目的和作用
目的：
筛选的目的在于除掉纸浆中相对密度小二体积大的杂质，如浆团、纤维束、草屑等。
净化的目的在于除掉纸浆中相对密度大的杂质，如沙粒、金属屑、煤渣等。
作用：
（1）除去纸料中残余的杂质
（2）制成均匀分散的纤维悬浮液
| 阅读短文,用方框中所给词填空,然后判正误 | |
Here is the l to my house. Go 2 Gold Street to the center of' town. You will see a big hotel on your left. It's a famous hotel called the State Hotel. Turn right on Grant Street. Turn 3 at the supermarket. Now you're on Market Street. My grandmother's home is on Market Street. Go down Market Street to Jones Avenue. Turn right on Jones Avenue. You are 4 my house. My house is 5 the left. The address is 117 Jones Avenue. | |
| 判断正误,正确的写"T",错误的写"F". ( )6. Tom is going to Jack's house. ( )7. There's a big hotel on State Street. ( )8. Grant Street and Market Street are in the same direction(方向)． ( )9. There's a supermarket on the corner of Grant Street. ( )10. Tom's house is on Jones Avenue. |