GB 5135.21-2025
UpcomingAutomatic sprinkler system—Part 21: Inspector's test connection
- Issued
- 2025-10-31
- Effective
- 2026-11-01
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Automatic sprinkler system—Part 21: Inspector's test connection
Observation indicator system for the black soil critical zone
Code of practice for breeding techniques of Iris ensata seedlings
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