coarse sand bottom 中文意思是什麼

coarse sand bottom 解釋
粗砂底
  • coarse : adj. 1. 粗糙的,粗劣的,粗製濫造的,下等的。2. 粗鄙的,粗俗的,粗暴的,下流的;猥褻的,(言語等)鄙俗的。adv. -ly ,-ness n.
  • sand : n 1 沙。2 〈 pl 〉 沙灘,沙洲,沙地,沙漠。3 〈 pl 〉 沙粒;(計時用的沙漏中的)細沙。4 光陰,時...
  • bottom : n 1 底,底部。2 地基,基礎;根底;底細,真相,原因,根源。3 (樹的)根干;(山)麓麓;〈方,常 pl...
  1. Up - flow filtration with coarse sand media, the water intaking from the bottom layer where the particle diameters of coarse media were the widest and outputting from the surface layer where the particle diameters of coarse media were the thinnest in the single media, was studied theoretically and experimentally in this research. it solved the difficult technical problem of reverse grain filtration

    本文對粗石英砂濾料上向流過濾技術進行了理論和實驗研究,在單一的濾層中待濾水循粒徑最粗的底層進,從粒徑最細的表層出,攻克了「反粒度過濾」的關鍵技術。
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