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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 5275.6-2014 |
Gas analysis―Preparation of calibration gas mixtures using dynamic volumetric methods―Part 6: Critical orifices 气体分析 动态体积法制备校准用混合气体 第6部分：临界锐孔 |
China National Standards orifices |
 English PDF |
| GB/T 30209-2013 |
Aircraft―Gravity filling orifices 飞机 重力加油口 |
China National Standards orifices |
English PDF |
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