Tracheal tubes-Specification for tubes of the Cole type
气管导管 科尔型管规范
1988-11-30
DIN 28184-2
Tubular heat exchangers with two fixed heads - Part 2: Internal tube type 25, square tube pitch 32 - Number and pattern of tubes
双固定头管式热交换器.第2部分:25型内管 32节方管.管的数量和型式
2009-01-01
YD/T 981.2-2009
接入网用光纤带光缆 第2部分：中心管式
Optical Fiber Ribbon Cables for Access Network Part 2:Central Loose Tube Type
2009-06-15
GB/T 28712.2-2023
热交换器型式与基本参数 第2部分：固定管板式热交换器
Types and basic parameters of heat exchangers—Part 2: Fixed tube sheet heat exchangers