Study the biological limit of urine trans, trans-muconic acid for occupational exposure to benzene.

研究尿中反式，反粘康酸对苯职业接触的生物学极限。

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Objective To study the biological limit of urine trans, trans-muconic acid(t, t-MA)for occupational exposure to benzene.

目的研究职业性苯暴露反-反式粘糠酸（t，t-MA）生物接触限值。

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