This standard specifies the inspection and evaluation methods for the metallographic structure of single-cast piston rings made of

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This standard specifies the type, model and series parameters of the main and passive gears of the oil pump of small and medium po

This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and stor

This standard specifies the rules for compiling the model numbers of air filters, diesel filters and oil filter assemblies for int