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对本医院住院病人使用中的菜票，抽取１８０张，随机分为３组，每组６０张。第１组不消毒，检测细菌污染；第２组加热蒸发４０％甲醛溶液（ ２５ ｍｌ／ Ｌ）熏蒸 １２ ｈ；第 ３组用 １： ２００稀释的“８４”消毒液（含有效氯２５０ ｍｇ／ Ｌ）浸泡 ３０ ｍｉｎ。检测第 ２
Of the hospital inpatient use of the tickets, drawn 180, were randomly divided into 3 groups of 60. The first group was not sterilized and the bacterial contamination was detected. The second group was fumigated with 40% formaldehyde solution (25 ml / L) for 12 h. The third group was disinfected with “84” L) for 30 min. Test the second