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根据国机科[1998]131号文批准、发布加了标准（实施日期1998－11－01）JB57O－1998防爆控制按钮（代替JB570－85）JB／T8731—1998防爆电机接线盒软连接结构制造检验规定JB／T8732—1998摆动式平板砂光机JB／T2195－1998YDFZ系列阀门电动装置用三相异步电动机技术条件（代替JB2
According to the National Bureau of [1998] No. 131 approved, issued a standard (the date of implementation of 1998-11-01) JB57O-1998 explosion-proof control button (instead of JB570-85) JB / T8731-1998 explosion-proof motor junction box soft connection structure manufacturing Inspection Provisions JB / T8732-1998 swing flat sanding machine JB / T2195-1998YDFZ series valve electric device with three-phase asynchronous motor technology (instead of JB2