精选优质文档-倾情为你奉上Abstract: Based on the comprehensive analysis on the plastic parts structure service requirement, mounding quality and mould menu factoring cost. A corresponding injection mould of internal side core pulling was designed. By adopting the multi-direction and multi-combination core-pulling. A corresponding injection mould of internal side core pulling was designed, the working process of the mould was introduced1,一个正方体的棱长为A,棱长之和是( ),当A=6厘米时,这个正方体的棱长总和是( )厘米. 2,一根长96厘米的铁丝围
