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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 3489-1983 |
Hardmetals--Metallographic determination of porosity and uncombined carbon 硬质合金 孔隙度和非化合碳的金相测定 |
China National Standards sity |
 English PDF |
| GB/T 2541-1981 |
Petroleum products--Computation table for viscosity indices 石油产品粘度指数算表 |
China National Standards sity |
English PDF |
| GB/T 2413-1980 |
Piezoelectric ceramic materials--Measuring methods for determination of volume density 压电陶瓷材料体积密度测量方法 |
China National Standards sity |
English PDF |
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