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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 31334.2-2015 |
Test methods for dipped canvas—Part 2: Yarn crimp on warp and density 浸胶帆布试验方法 第2部分：经向卷曲度和密度 |
China National Standards Test methods warp |
 English PDF |
| GB/T 31352-2014 |
Test methods for warp of sapphire substrates 蓝宝石衬底片翘曲度测试方法 |
China National Standards Test methods warp |
English PDF |
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