The King's chamber is found at the center from the pyramid, only available from the Great Gallery and an ascending corridor. Clay and sandstone are the two types of rock formations, but clay could be unstable in specified problems. 反滤�?在排水设施之间，沿渗流方向将砂、石料按颗粒粒度或孔隙率逐渐增大的顺序分层铺筑而成的防止管涌的滤水设施�?过滤�?对灌溉水进行物理净化处理的装置。 The impl... https://www.xudafiltration.com/filter-plate/