A survey of the health condition of 308 cases of workers exposed to benzene, toluene, xylol and mixed derivatives of benzene is presented.

本文报告了308例苯、甲苯、二甲苯及混合苯作业工人的健康状况调查结果。

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The advertisements were a response to a recent survey released by the World health Organization, which found that more than 30 percent of residents in the cities are in sub-health condition.

本次宣传广告是对世界卫生组织近期公布的一项调查的响应。调查发现，超过30%的城市居民处于亚健康状态。

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Method A multi-stage stratified cluster sampling survey on health condition of 14486 residents was taken in 2007.

方法：采用多阶段分层整群抽样方法，对2007年居民家庭健康状况入户调查，共调查14 486人。

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Method A multi-stage stratified cluster sampling survey on health condition of 14486 residents was taken in 2007.

方法：采用多阶段分层整群抽样方法，对2007年居民家庭健康状况入户调查，共调查14 486人。

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