Cart:
| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 40117-2021 |
Non-destructive testing - Evaluation of vision acuity of NDT personnel 无损检测 无损检测人员视力评价 |
China National Standards acuity |
 English PDF |
| GB 11533-2011 |
Standard for logarithmic visual acuity charts 标准对数视力表 |
China National Standards acuity |
English PDF |
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