压缩内包含数据模型如下： PI20D75圆光栅装配.STEP PI20D100圆光栅装配.STEP PI20D115圆光栅装配.STEP
PI20D150圆光栅装配.STEP PI20D200圆光栅装配.STEP PI20D300圆光栅装配.STEP
