管子直径 meaning in English

external diameter of the pipe

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研究了管长、管径对储氢性能的影响，得出如下的结论：在管径d = 4 . 0nm至5 . 0nm间，管内氢分子平均数密度取最大值；当管子直径固定后，储氢量随管长增加而线性增加。
The pipe cutters are very simple to operate : simply clamp a pipe of the desired length in the self - centering vise , then rotate the machine head containing the saw blade once around the pipe . for cutting and beveling stainless steel pipes , special saw blades and bevel cutters are available . the saw blades are small , inexpensive and available in different versions for different materials and wall thicknesses
该便携式机器操作简便，节省空间。将要切割的管子固定在“自对中式”夹紧装置上，管子不会产生变形，管子直径及材质相适应的切割速度可快速调节。手持切割头绕管子一周，电动刀片便将管子切断，无毛刺，不变形。