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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 20851.4-2019 |
Electronic toll collection—Dedicated short range communication—Part 4:Equipment application 电子收费 专用短程通信 第4部分：设备应用 |
China National Standards 4:Equipment |
 English PDF |
| GB/T 18851.4-2005 |
Non-destructive testing-Penetrant testing-Part 4:Equipment 无损检测 渗透检测 第4部分:设备 |
China National Standards 4:Equipment |
English PDF |
| GB/T 7341.4-1998 |
Audiometers--Part 4:Equipment for extended high-frequency audiometry 听力计 第4部分 延伸高频测听的设备 |
China National Standards 4:Equipment |
English PDF |
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