head process meaning in English

核燃料后处理首端过程

One exception to the heading processing is that each heading must be at the same level as , or one level below , the original heading
标题处理的一个例外是，每个标题必须和第一个标题处在同一级上，或者是低一级。也就是说，在以
Company has imported multi - head processing machine , automatic lathe , turret , lathe and advanced precise intellectual inspection equipment to guarantee the quality
司已引进国外先进的多头机加工中心自动车床六角车床实现生产自动化，并具备先进的高精度智能化检测设备。
The main achievements are as follows : it is verified that there is an unique mean square solution to the stochastic surge model ; the formulas for probability density function of head loss and the maximum relative surge level were deduced ; the joint probability density function for solving surge process and the mean head process of simple hydraulic system were also derived
主要研究成果有：证明了调压室涌浪随机模型存在唯一的均方解；推导出了水头损失和最大相对涌浪值的密度函数计算公式；求解了调压室涌浪解过程的联合密度函数和简单水力系统的水头均值过程等。