Standard Code | Standard Title | Standard Class | Order |
---|---|---|---|
GB/T 28504.2-2021 |
Rare earth doped optical fibre—Part 2:Characteristics of double-cladding thulium-doped optical fibre 掺稀土光纤 第2部分:双包层掺铥光纤特性 |
China National Standards 2:Character |
English PDF |
GB/T 12508-1990 |
Alphanumeric character sets for optical recognition--Part 2:Character set OCR-B--Shapes and dimensions of the printed image 光学识别用字母数字字符集 第二部分:OCR-B 字符集印刷图象的形状和尺寸 |
China National Standards 2:Character |
English PDF |
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