Standard Code | Standard Title | Standard Class | Order |
---|---|---|---|
GB/T 1149.4-2021 |
Internal combustion engines—Piston rings—Part 4:Quality requirements 内燃机 活塞环 第4部分:质量要求 |
China National Standards 4:Quality |
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GB/T 18737.4-2003 |
Textile machinery and accessories--Beams for winding--Part 4:Quality classification of flanges for Weaver’s beams,warper’s beams and sectional beams 纺织机械与附件 经轴 第4部分:织轴、整经轴和分段整经轴边盘的质量等级 |
China National Standards 4:Quality |
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