reference diameter

Concentricity error is positioning error, The tolerance zone is a reference axis for axis, with tolerance values for diameter cylinder.

同轴度误差属于定位误差，其公差带是以基准轴线为轴线、以公差值为直径的圆柱面区域。

On the basis of the characteristics of aquiferous gas wells in this area, some suggestions on the depth for gas-lift valve at the top, valve opening's diameter and calculation process are presented for reference in gas-lift design.

根据该区有水气井的特点，提出顶部气举凡尔设置深度、阀孔直径和计算序次等方面的意见，供气举设计参考。

This paper makes reference to much relevant information and analyzes different technique of machining, and finally adopts roll-pressing to process spirally grooved tube. Main parameters of spirally grooved tube have diameter of tube, wall thickness, corrugation depth and fin pitch.

本论文参考了大量的有关资料，分析了不同加工工艺特点，最后采用了滚压成型的生产工艺来加工螺旋槽管，其主要结构参数有管材外径d、壁厚t、槽深e、螺距p。

Objective We examined the definitive effect of tumescent perfusion pressure, diameter of fat injection needle, lidocaine, epinephrine and garamycin on fat viability by glucose transportation test to offer reference to clinical practice.

目的：以葡萄糖转移实验检测肿胀液灌注压、注射针管内径，利多卡因、肾上腺素、庆大霉素对脂肪颗粒活性的确切影响，为脂肪移植术中如何控制这些因素提供参考。