This standard specifies the types and basic parameters of oil-injected screw single-stage refrigeration compression condensing uni

This standard specifies the method for conducting performance tests on a test bench for gasoline engines used in construction mach

This standard specifies the test method and test procedure for the carburetor integrated flow test bench. JB/T 5143-1991 Carbureto

This standard specifies the technical requirements, inspection rules, packaging, storage and transportation for the manufacture of

This standard specifies the test methods for the appearance, density, conditional viscosity, suspension, gas evolution and wear re

This standard specifies the basic dimensions and positioning forms of core heads for casting patterns. This standard applies to wo

This standard specifies the form, basic parameters and selection method of the draft angle of casting patterns. This standard appl

This standard specifies the method for safety assessment of welded joints according to the brittle fracture principle. This standa