Through description of three-steps characteristic of dual economic theory and its practical significance to the process of industrialization and urbanization in China, and making comparative analysis between important criterion of "Lewis turning point" and current situation of rural surplus...

In order to establish a supply system for energy resource coupled with the environment, the production technology of sugar beets was explored as a biological energy source. The low-humic andosol as the experimental soil, the panting method was direct planting, and cultivation technique was...