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Measuring Instruments Product Certification
Number Product Name GB/T7635 Code Standards
1 Portable detectors for combustible gas Product quality certification GB15322.3 Combustible gas detectors – Part3: Portable detectors for combustible gas with measuring range of 0~100%LEL
2 Portable detectors for combustible man-made gas Product quality certification GB15322.6 Combustible gas detectors – Part6: Portable detectors for combustible man-made gas
3 Self-contained detectors for combustible man-made gas Product quality certification GB15322.5 Combustible gas detectors – Part5: Self-contained detectors for combustible man-made gas
4 Self-contained detectors for combustible gas Product quality certification GB15322.2 Combustible gas detectors – Part2: Self-contained detectors for combustible gas with measuring range of 0~100%LEL
5 Bridge engineering Safety (Safety features) JTG/TJ21 Specification for Inspection and Evaluation of Load-bearing Capacity of Highway Bridges
JTG/TH21 Highway bridge technical condition assessment standard
YC4-4/1978 Test method for long-span concrete bridge


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