Around the city B. City itself C. The area near the city D. Big city and its neighbor area
A. 找出易感人群 B. 为制定职业卫生标准提供依据 C. 确定环境监测的范围 D. 找出接触职业有害因素与发病之间的联系 E. 确定剂量-效应关系
A. 0.05~0.07mg B. 0.07~0.09mg C. 0.09~0.11mg D. 0.11~0.13mg E. 0.13~0.15mg