In this paper,three elevators for the design of objects, combined with Sanken VM06 series of high-performance constant torque converter, developed a two-speed exchange of PLC elevator control system.

Effect of drought on soybean production in summer and autumn in Jiusan Reclamation Area of Heilongjiang in 2007;

Applying grey relation method to evaluate groundwater quality in Jiansanjiang land reclamation area;

Classification and Ordination of the Wetland Plant Communities in the Jiansanjiang Farming Bureau,the Sanjiang Plain;