Objective: To investigate the changes of the activities of urine brush border enzymes inlead exposed workers and their significances.
目的：探讨铅接触者尿绒毛膜酶活性的变化及其意义。
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Canvas is painted in light colors, thrilling stroke of the brush and linear drawing lead us to romantic human vision that have no concrete body, but embrace lucidity of sky, water and ground.