What is the meaning of Metropolitan area? ()
Around the city
B. City itself
C. The area near the city
D. Big city and its neighbor area
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职业流行病学调查的目的主要是()
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
每千克体重每天的适宜摄氟量是()
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