为探讨模拟地下水微生物除铁技术的若干控制因素以及微生物除铁的部分规律，对四个装有不同粒径石英砂填料的滤柱进行人工模拟实验及......

After the pyramids,obelisks must be the most iconic symbol of Ancient Egypt,but visually little is known about the means......