241 GB/T 13756-1992 三足式離心機型式和基本參數 Three-column centrifuge--Types and basic parameters
242 GB/T 13928-1992 微型往復活塞空氣壓縮機 Reciprocating piston micro air compressor
243 GB/T 13929-1992 水環真空泵和水環壓縮機試驗方法 Methods of testing for water-ring vacuum pumps and compressors
244 GB/T 13930-1992 水環真空泵和水環壓縮機氣量測定方法 Methods for the measurement of volume flow of gas of water-ring vacuum pump and compressor
245 GB/T 13931-1992 電除塵器 性能測試方法 Methods of performance tests for electrostatic precipitators