As lead and arsenic pollution element are skew distribution, statistics of a naturalbackgroundvalue and a content of lead and arsenic are worked out using median method of skew distribution.
由手铅、砷污染元素呈偏态分布，故采用偏态分布中的中位数法作了铅、砷自然背景值及含量的统计。
2
He brings his natural and educational background to audit companies based on a continual process approach that confutes many-faced value management systems.
他带着他的天赋和教育背景，基于驳倒了很多面向价值的管理系统的持续过程方法去审核公司。
3
These results have provided useful bases for recommending reference dose of related natural radiation exposure, parameters of Chinese reference Man and backgroundvalue of radiation monitoring.