Surface mottle of BMC parts is one of common quality defects. This is a difficult problem because many effected factors are undefinite.
不饱和聚酯树脂模塑料压制件表面颜色不均匀是常见的质量难题之一。
2
In this paper a suffitient and necessary condition of factoring on the polynomial of three variables power two is obtained by using undefinite co efficient method.