依据1989—2003年监测数据，分析了西安市大气中硫酸盐的时空变化。
Using monitored data of air sulphation speed for 1989-2003, the space-time change in (Xi 'an) City is analyzed.
铅仍为西安市蔬菜中的主要污染元素。
The major pollutant element is Pb in vegetables of Xian city.
目的探讨西安市无偿献血人群中血液检测不合格数与肝炎病毒感染的关系。
Objective to study the relationship between blood screening unqualified in unpaid blood donator and hepatitis virus infecting in Xi 'an city.
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