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我市某单位1988年11月23日安装两台WNL240-7/95/70-AⅡ型热水锅炉投入运行后,仅5个冬季累计运行1年半时间,其中一台锅炉更换烟
After a unit of our city installed two WNL240-7 / 95/70-A Ⅱ hot water boilers on November 23, 1988, only five winter months had run for a year and a half. One of the boilers replaced the smoke