重点阐述了铝、铜合金铸件生产中较常应用的五种浇注时间计算公式的特点和存在的不足，分析了这几种公式在各自的材质铸件使用范围内出现的缺点及不足。
Features and shortcomings of five popular formulas for calculating pouring time in al, cu alloy casting product are described. Every formula's shortcoming in its material range is analyzed.
在此基础上，对现有的常用的医学图像处理技术的方法和算法进行分析比较，分析出各种算法的特点、适用范围以及能够发挥最大优势的使用范围。
Analyze and compare the common medical image process techniques and algorithms and find out their respective features, application fields and scopes to make greatest advantage.
酚类化合物作为重要的工业原料和很多工业企业生产的副产物，具有使用范围广、对环境危害性大的特点，成为常见的工业污染物。
As an important industrial raw materials and by-products of many industrial enterprises, phenolic compounds are now common industrial pollutants with features of a wide range and detrimental.
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