Respiratory responsiveness was measured by methacholine chloride bronchial provocation test in 163 new cotton workers before and after 10 weeks exposure to cotton dust.
为研究棉尘病发病机制，对163名棉纺厂新工人，于接尘10周前、后分别进行氯化乙烯甲胆碱支气管激发试验；
Respiratory responsiveness was measured by methacholine chloride bronchial provocation test in 163 new cotton workers before and after 10 weeks exposure to cotton dust.
为研究棉尘病发病机制，对163名棉纺厂新工人，于接尘10周前、后分别进行氯化乙烯甲胆碱支气管激发试验；
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