(PCD)相关论文
The hierarchy and definition of the precipitation-concentration degree and precipitation-concentration period of annual ......
分析切割钢丝拉拔过程中压缩变形功、摩擦阻力功及在变径区由于速度突变而消耗的多余变形功,分别推导其相应的功率损耗数学公式,最后......