顶杆及叉杆（）用于竖立8米以下的（）杆，不准铁锹、桩柱等代用。
参考答案：只能；拔稍
看一看，填一填。
1. It's time to _____
2. Whose are these?
3. Those are my new _____.
4. This is my _____.
5. I have a green _____.
6. It's time for _____.
请概括利用沼气池和高温堆肥等方式对人粪尿进行无害化处理的原则是什么？
