The main reasons that perennial weeds has becoming the dominant weeds in Heilongjiang Province were summarized. The biological mechanism that explained why it w
In this study, the modeling and simulating of seeder were researched, and the method of virtual designing of seeder using computer was implemented. Based on the
In order to investigate the mechanism of action of immunoenhancer,the effects of the traditional Chinese medicine immunopromoter on the quantity and the transfo