Proportion of solid colour fibres can be exactly predicted utlizing the least square calculating method.This colour matching result is matchable to spectrum.

使用最小二乘算法可以准确的预测各单色纤维的比例，配色结果可以达到光谱匹配。

The familiar structures of loose core and ejector of hydrocylinder in injection mold were introduced.The calculating method of selecting hydrocylinder and the key points in using it were discussed.

介绍了液压油缸在注塑模具中常见的抽芯及顶出结构,并对选取油缸的计算方法和使用要点进行阐述。