底直径 meaning in English

bottom diameter

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。
The conical insulator high 15 cm , the diameter of top is 5cm and that of the bottom is 35cm . the insulator is operated for more 300 times on voltage more 600kv , and maximum voltage is 750kv . the operated is stability and no surface flashover phenomenon is happened
锥形绝缘子高15cm ，锥底直径35cm ，锥顶直径5cm ，实验结果表明满足设计要求，在600kv以上工作300多次，最高电压达750kv ，运行稳定，未发生沿表面闪络现象。