2.At the same content of chlorinated polyethylene (CPE) and nano-CaCO?3 in formulation, the impact strength of rare earth stabilizer system was 4.3 times higher than that of lead salt system, and their tensile strengths were comparable.
8.The front earth pressure value could also be controlled in the range of set value by adjusting the advancing speed, screw conveyor revolving speed and cutting wheel revolving speed, which lead to reduce ground deformation.
9.The findings may lead scientists to rethink some of their theories about where comets come from and their role in providing some of the essential ingredients for life on Earth.
10.Xitie mountain lead zinc ore is located in Qinghai province, through many years exploring, there exists a 3.2 million empty area. Along the direction of exploring, earth surface collapse has happened in many parts. It must influence the mine production safety if let it be.
