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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 34428.3-2017 |
Communication rules of the devices of surveillance and control system for expressway—Part 3：LED changeable message sign 高速公路监控设施通信规程 第3部分：LED可变信息标志 |
China National Standards changeable |
 English PDF |
| GB 23826-2009 |
light-emitting diode changeable speed limit signs of expressway 高速公路LED可变限速标志 |
China National Standards changeable |
English PDF |
| GB/T 23828-2009 |
Light-emitting diode changeable message signs of expressway 高速公路LED可变信息标志 |
China National Standards changeable |
English PDF |
| GB/T 22132-2008 |
Microscopes - Diameter of interchangeable eyepieces 显微镜 可换目镜的直径 |
China National Standards changeable |
English PDF |
| GB/T 21297-2007 |
Laboratory glassware - Interchangeable conical ground joint 实验室玻璃仪器 互换锥形磨砂接头 |
China National Standards changeable |
English PDF |
| GB/T 14149-1993 |
Laboratory glassware--Interchangeablespherial ground joints 实验室玻璃仪器 互换球形磨砂接头 |
China National Standards changeable |
English PDF |
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