GB/T 14742-1993 Test methods of port pneumatic grain unloader

GB/T 14741-2009 Port pneumatic grain unloader

JT 5017 LS 51~54 LS 51~54 LS 51~54 LS 51~54 GB/T 1236-2000 Industrial fans—Performance testing using standardized airways GB/T 1236-2017 Industrial fan—Performance testing using standardized airways GB/T 3222-1994 Acoustics—Measurement method of environmental noise GB/T 3222.1-2006 Acoustics—Description, measurement and assessment of environmental noise—Part 1:Basic quantities and assessment procedures GB/T 3222.1-2022 Acoustics—Description,measurement and assessment of environmental noise—Part 1:Basic quantities and assessment procedures GB/T 3222.2-2009 Acoustics—Description,measurement and assessment of environmental noise—Part 2:Determination of environmental noise levels GB/T 3222.2-2022 Acoustics—Description,measurement and assessment of environmental noise—Part 2:Determination of sound pressure levels GB/Z 3222.3-2026 Acoustics—Description, measurement and assessment of environmental noise—Part 3:Objective method for the measurement of prominence of impulsive sounds and for adjustment of L Aeq