bottom diameter meaning in English

底直径
地际直径
干基直径
根际直径
螺纹内径, 螺纹底径

In the five - layer tower , 23 . 38 meters high tower , bottom diameter of 5 m , minus 1 . 80 of a body , one on each floor are open window
归龙塔共5层，塔高23 . 38米，塔底直径5米,塔身呈八角面体，每层均开一窗。
Some kind cylinder liner request measure nine parameters : inside and outside diameters in different positions , width of the boss of the part , hydraulic packing trough bottom diameter , shoulder place fillet partial diameter , and so on
某型气缸套要求测量九个参数:不同位置内外径,凸台宽度,以及水封槽底径和肩台处的圆角部分的直径等。