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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 2987-1996 |
Letter symbols of parameter for electronic tubes 电子管参数符号 |
China National Standards Letter symbols be |
 English PDF |
| GB/T 13394-1992 |
Letter symbols to be used in electrical technology--Symbols for quantities to be used for rotating electrical machines 电工技术用字母符号 旋转电机量的符号 |
China National Standards Letter symbols be |
English PDF |
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