NY/T 646-2002 Quality appraising standard for screw conveyer

GB/T 2828-1987 GB/T 3768-1996 Acoustics—Determination of sound power levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane GB/T 8170-1987 Rules for rounding off of numberical values GB 9969.1-1998 General principles for preparation of instructions for use of industrial products GB 10395.1-2001 Tractors and machinery for agriculture and forestry—Technical means for ensuring safety—Part 1:General GB 10396-1999 Tractors,machinery for agriculture and forestry,powered lawn and garden equipment—Safety signs and hazard pictorials—General principles GB/T 985-1988 Basic forms and sizes of weld grooves for gas welding manual arc welding and gas-Shielded arc welding GB/T 985.1-2008 Recommended joint preparation for gas welding,manual metal arc welding,gas-shield arc welding and beam welding GB/T 985.2-2008 Recommended joint preparation for submerged arc welding GB/T 985.3-2008 Recommended joint preparation for gas-shield arc welding on aluminium and its alloys GB/T 985.4-2008 Recommended joint preparation for welding on clad steels GB/T 4064-1983 General guide for designing of electrical equipment to satisfy safety requirements JB/T 5673-1991 A general technical specification for painting of agricultural and forestry tractors and implements JB/T 7679-1995 Spiral conveyor。