Sludge bulking property of membrane bio-reactor was investigated in this study through contrast research. When the sludge bulking appeared, the removal efficien
A detailed research in soil improving measure was conducted during the process of plants that were cultivated in Tianjin saline and alkaline area. The results s
A new type continuous variable transmission device, a hydro-mechanical continuously variable transmission (HMCVT) for agricultural tractors is developed, which
Rural finance is an issue conced with rural people, improving rural financial management is important to close the relations of cadres and masses, maintain rura