将接触氢醌、三甲氢醌和维生素甲氢醌的33名工人做为H组;15名接触甲硫氨酸者为M组,55名同厂机关职员做为对照组(C组),三组在人群特征,吸烟习惯方面尽量接近。受试者症状填入英国医学研究会“慢性支气管炎调查表”的各项内容中。用计算机呼吸 Thirty-three workers exposed to hydroquinone, trihydroquinone and vitamin hydroquinone were selected as group H; 15 were exposed to methionine, M was assigned to control group, 55 were staffed with control group (Group C) Group in the crowd characteristics, smoking habits as close as possible. Subject Symptoms Fill in the British Medical Association “chronic bronchitis questionnaire” of the various contents. Use computer to breathe