Friday, September 16, 2022
Wednesday, November 29, 2023
Thursday, September 22, 2022
Sunday, September 18, 2022
问题:某地有30万人口,农村居民占90%,现欲作农村居民HIV感染情况及其影响因素的调查研究,较适宜的调查方法是()。...
Thursday, September 22, 2022
Thursday, September 22, 2022
Friday, September 16, 2022
Thursday, September 22, 2022
问题:单选题预防地方性甲状腺肿流行的最有效措施是()。A 食用碘盐B 除去水中硫氰酸盐C 煮沸饮水D 降低饮用水的硬度E 饮水除氟...
Monday, June 26, 2023
Tuesday, September 20, 2022
问题:为保证生活饮用水卫生安全,保障人民健康,环境卫生工作者要重点掌握饮用水的卫生调查.监测和监督,包括对集中式给水的水源选择...
Thursday, September 22, 2022
问题:单选题预防地方性甲状腺肿流行的最有效措施是()。A 食用碘盐B 除去水中硫氰酸盐C 煮沸饮水D 降低饮用水的硬度E 饮水除氟...
Monday, June 26, 2023
Monday, September 19, 2022
Saturday, August 12, 2023
Monday, August 8, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Thursday, September 22, 2022
Tuesday, August 9, 2022