管标准 meaning in Chinese

pipe standards

Standard for concrete and reinforced concrete well pipes
混凝土与钢筋混凝土井管标准
Standard specification for seamless copper pipe , standard sizes
无缝铜管标准尺寸标准规范
Certified by iapmo usa for drinkable water pipe standards
通过美国卫材协会iapmo饮用水管标准之认证。
Study of diffusion tube calibration gases preparation and dynamic volumetric method
扩散管标准气体及其动态配气方法的研究

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