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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 17485-1998 |
Hydraulic fluid power--Pumps，motors and integral transmissions--Parameter definitions and letter symbols 液压泵、马达和整体传动装置参数定义和字母符号 |
China National Standards Letter symbols parameter |
 English PDF |
| GB/T 2987-1996 |
Letter symbols of parameter for electronic tubes 电子管参数符号 |
China National Standards Letter symbols parameter |
English PDF |
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