In literatures of classical parallel machine scheduling, people often study the precedenceconstraint among jobs.
在经典的平行机排序文献中，人们往往研究工件间的序约束。
2
To exert the constraints, the assembly precedence is modeled and the precedence matrix and data file used to describe the precedenceconstraint are proposed.
提出了装配优先约束关系模型和约束关系模型的优先矩阵表达法与数据文件表达法。
3
Position precedence rule. When resolving the float box position, the optimum vertical constraint takes precedence over the optimum horizontal constraint.