废弃物流技术包括：垃圾掩埋、垃圾焚烧、垃圾堆放、净化处理加工。
参考答案：对
The class _____ 80 students is hard to manage. [ ]
A.consisting of
B. consists of
C. making up of
D. made up
数值天气预报结果中的粗糙度是指贴近地面平均风速为（）处的高度。
A.3m
B.2m
C.1m
D.0m
