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选择接触环氧乙烷1年以上,40岁以下女工79人为接触组,以其它因素大致齐同的仪表行业女工168人为对照组,进行月经状况调
Select exposure to ethylene oxide more than 1 year, 79 women under the age of 40 for the contact group, other factors roughly the same instrument industry 168 women as the control group, the menstrual condition