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machine information '' Integration: 121gb/t internal combustion engine piston rings trapezoidal rings and wedge rings internalcombinationengines -- pistoning polyurethane is the abbreviation of polyurethane s -- keystoneringsandhalfkeystones

122gb/t boiler water and cooling water analysis methods for solid substances analysisofwaterusedinboilerandpoolingsystem -- terminationofsolidsmatter

123gb/t boiler steam utilization and coating Materials can withstand long-term high-temperature baking and extreme external conditions sampling methods for samplingboilerstart

124gb/T boiler water and cooling water analysis methods determination of total silicon analysisofwaterusedinboilerandcoolingsystem--terminationoftotalsica

125gb/T boiler water and cooling water analysis methods determination of copper analysisofwaterusedinboilerandcoolingsystem--terminationofcopper

126gb/T boiler water And cooling water analysis methods determination of alkalinity analysisofwaterusedinboilerandcoolingsystem--determinationofalkalinity

127gb/t boiler water and cooling water analysis methods determination of chemical oxygen consumption potassium dichromate rapid method analysisofwaterusedinboilerandcoolingsystem--determinationofchemicaloxygendemand--rapidmethod withpotassiumchromate

128gb/t boiler water and cooling water analysis methods determination of polyacrylic acid turbidity Methodanalysisofwaterusedinboilerandpoolingsystem--determinationofpolycrylicacid--turbodimetricmethod

129gb/t boiler water and cooling water analysis methods benzotriazole determination UV spectrophotometry analysisofwaterusedinboilerandpoolingsystem--determinationofbenzotriazole--ultravioletspectrophotomer hydraulic universal testing machine is mainly used for metal, non-metallic materials and parts, components, components of the tension, contraction Zigzag and other mechanical property experiments y

130gb/t boiler water and cooling water analysis method determination of 2-Mercaptobenzothiazole ultraviolet spectrophotometry analysisofwaterusedinboilerandcoolingsystem -- 2-Mercaptobenzothiazole -- ultravioletspectrophotometry

131gb/t boiler water and cooling water analysis method determination of residual chlorine analysisofwaterusedinboilerandcoolingsystem -- terminationoffreeclerieresiduals

132gb/t boiler water And cooling water analysis methods determination of hydrogen sulfide spectrophotometry analysisofwaterusedinboilerandcoolingsystem--determinationofsulfuredhydrogen--spectrophotography

133gb/t boiler water and cooling water analysis methods determination of sulfite analysisofwaterusedinboilerandcoolingsystem--determinationofsulfite

134gb/t boiler water and cooling water analysis methods determination of iron at least Dcoolingsystem -- determinationofiron

135gb/t boiler water treatment equipment terminology boilerwatertreatmentequipments -- terminologies

136gb/t crankshaft shafting torsional vibration measurement and evaluation methods torsionalvibrationofcrankshaftsystems -- measurementandevaluationmethod

137gb small gasoline engine noise limit ofsmall gasolineengine

138gb/T&