In order to study load changes of the dynamic load lining under the penetration weapon—GBU28,the load changes of four kinds of enclosing rocks were calculated and compared through empirical formula.

This paper studies on the influence of crops insolation, mixed sowing crops and green nanure to soil erosion that has an active function to prevent and treat water and soil erosio

Study of Checking Decvice for Malfunction of Cable Communication;