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我厂洗选系统有一台φ1800×6900螺旋分级机,1982年5月投产,下轴承水封装置从1982年10月至1986年7月的统计结果表明,每套平均使用寿命只有48.6d(两班作业),主
I plant washing system has a φ1800 × 6900 spiral classifier, put into operation in May 1982, the next bearing seal device from October 1982 to July 1986 the statistical results show that the average life of each set is only 48.6d (two Class homework), Lord