concentration of cotton dust
concentration of cotton dust
棉尘浓度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The epidemiological investigation showed that effect of cotton dust on pulmonary function in exposed workers was mainly acute change, and concentration of cotton dust was direct ratio with the harm.
职业人群调查表明，棉尘对工人肺功能影响以急性改变为主，且棉尘浓度与危害成正比。
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