The Newton iteration method is used to solve the economic pressure on the unknown node so as to calculate the economic head loss and economic pipe diameter of each section and economic head of second-stage pump station .

采用牛顿迭代法来求解各 未知节点的经济水压，进而得出各管段的经济水头损失、经济管径和水源二级 泵站的经济扬程。

It is widely used in channel control surveying to define the coordinates of unknown points by ranging intersection for setting free-station of total station .

利用 全站仪自由设站测边交会确定 待定点的坐标，在航道控制测量工作中得到较好的应用。

In the unknown mobile coordinates premise exploring the optimal layout of detection station becomes the key technical problem of non-cooperative location . 4 、 Location equations calculating problem : The position coordinates of mobile station come down to the solution of location observation equations .

在 未知移动台坐标的前提下，探索侦测 站的最优布局，成为非合作定位的关键技术问题。4、定位方程解算问题：移动台的位置坐标归结为定位观测方程组的解。

In the early stage of subway design because of many unknown variables and the complicated character of subway station heat load calculation it is hard to use a simplified mathematical model to get the precise result .

由于在地铁早期计划阶段，很多参数都是 未知的，同时由于地铁 车站热负荷的复杂性，要通过一个简化的数学模型来求它们的精确解是很困难的。

Part V focuses on the rights of the victims were unknown when the determination of compensation Analysis of the assistance station the Civil Administration can not be the right person eligibility reasons made the right should be given the status of specific organs .

第五部分着重论述了受害人 身份 不明时赔偿权利人的确定问题，分析了救助 站、民政局不能成为适格权利人的原因，提出应当赋予特定机关权利人地位。