简述危险固体废物的危害特性?
参考答案:
急性毒性、易燃性、腐蚀性、反应性、放射性、浸出毒性
配送中心采用电子标签技术,实现作业的无纸化,工作效率可提高()%。
A.80
B.50
C.30
D.20
Most of the people in this village have free access ______ clean drinking water. [ ]
A. with
B. for
C. by
D. to