This standard specifies the method for determining the copper content in copper tungsten carbide vacuum contact materials. This st

This standard specifies the method for determining the copper content in copper tungsten carbide vacuum contact materials. This st

This standard specifies the determination method of cadmium content in silver zinc oxide electrical contact materials. This standa

This standard specifies the determination method of magnesium content in silver zinc oxide electrical contact materials. This stan

This standard applies to power transformer products that meet 7B. JB/T 1505-1975 Semiconductor power converter model compilation m

JB/T 1504-1993 Rectification equipment for electroplating JB/T1504-1993 Standard download decompression password: www.bzxz.net

This standard specifies the type, basic parameters and technical inspection rules of large AC three-phase synchronous motors for m

This standard replaces JB 1472-75. This standard specifies the basic types, main dimensions, model representation methods, technic