The study on crack types and their formation mechanisms of silver based contact materials are carried out according to the various currents and various contact closed forces.
根据不同电流等级及不同触头闭合压力，对银基触头材料裂纹类型及形成机理进行了分析研究。
2
The formation of many closed loop control by the screening equipment to achieve the required size.
形成闭路多次循环，由筛分设备控制达到所要求的粒度。
3
The forth part deep into analyzes the reasons that lead to formation of closed type of economy in Taijiang county, namely the closing of natural environment, social environment and the idea's closing.