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'2020'
China GB Standards List

 GB/T 9966.1-2020  
Test methods for natural stone--Part 1: Determination of dry, wet and after freezing compressive strength

天然石材试验方法 第1部分:干燥、水饱和、冻融循环后压缩强度试验
 GB/T 36702.2-2020  
Irrigation equipment—Safety devices for chemigation—Part 2: Chemigation valve assemblies from DN 75(3〞) to DN 350(14〞)

灌溉设备 化学灌溉用安全装置 第2部分:DN 75(3〞)至 DN 350(14〞)的化学灌溉阀组件

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