橡胶的过滤网如何选取？
参考答案：
橡胶的过滤网一般选用30目和60目滤网各一层；特殊胶料可选用40目和80目滤网各一层。
用所给词的适当形式填空。
1. We'd like to ____ (away) for about three weeks.
2. We also need to stay in an ____ (expensive) hotel to save money.
3. We would like to travel to an ____ (excite) place.
4. We ____ (especial) love hiking and swimming.
5. We love all kinds of outdoor ____ (activity).
6. This place is very ____ (education).
7. The bus is very____ (crowd).
8. I love to visit places that are ____ (relax).
禁止使用哪些材料作为加固材料和制作加固装置？
