未知数

In the problem, there are m persons who are to be assigned to do n jobs, and the number of the persons who are assigned to do the jth job is bj, where bj is an unknown positive integer number to be calculated such that djbjej, dj and ej are known positive integer number (j=1,2,…,n) such that ∑nj=1bj=m and m≥n.

考虑一类较一般的最优指派问题：欲指派m个人做n项工作，要求每个人只做一项工作，第j项工作可以由bj个人共同去做，其中bj是待求未知数，满足dj≤bj≤ej(即ej，dj为第j项工作所需人数的上下限)及∑nj=1bj=m，dj，ej为已知常数，j=1，…，n。

The great unknown, however, is the spending culture of NBA owners this summer in a bedraggled economy.

最大地未知数是，在动荡不安的经济大环境下， NBA 老板们今年夏天的"支出哲学"究竟几何？

As implicit pressure and explicit saturation method is selected to calculate black oil model and the bottom-hole pressure is introduced, the coefficient matrix of pressure equation becomes bordered seven-symmetrical matrix.

用IMPES法求解黑油模型，引入井底压力为未知数时，压力方程的系数矩阵变成了加边的七对角阵。

As implicit pressure and explicit saturation method is selected to calculate black oil model and the bottom-bole pressure is introduced, the coefficient matrix of pressure equation becomes bordered seven-symmetrical matrix.

IMPES法求解黑油模型，引入井底压力为未知数时，压力方程的系数矩阵变成了加边的七对角阵。

Through the C language to achieve Gaussian elimination method, the basic idea is to eliminate every time an unknown, the original equation into the equivalent of the triangle equations.

详细说明：通过C语言实现高斯消去法，基本思想是每次消去一个未知数，把原来的方程化为等价的三角形方程组。

Then I finally have time to see you today,not only for fear that you may forget me, but also the harvest this year will be bad. Whether this project will be funded is unexpected, so I have to devote myself to the grapery, yet I will still share with you the dream to do our business and things about our beautiful hometown as long as I am free.

今天终于抽空上来跟大家打招呼，虽然我很怕你们忘了我，但是更怕今年的葡萄收成不好，因为这个项目能不能得到投资还是个未知数，所以还是专心我的葡萄园，闲暇之余和大家讨论下各自的创业梦想和我们美丽家园！

This recording is a very logical sequel to the cry of Love which Hendrix was working on at the time of his death.

他决定要用这项能力，一次又一次地回到过去改变已经发生过的事实，希望竭尽所能挽回未婚妻的生命，却总是引起更难以想像的连锁反应，最后，他终究要面对人生有得必有失，而且充满未知数的真相

Hewer analysis, employment programs in line with the electorate demands of the resistance in Congress, I believe that will pass muster, but as health care, as well as the rest of the program to help consumers, because there is still controversy within the Congress, whether by still unknown.

休尔分析，就业方案符合选民诉求，在国会中的阻力小，相信能过关，但如健保以及其馀帮助消费者的方案，由于国会内部仍有争议，能否通过还是未知数。

It remains to be seen if the 27-year-old will make the move to Spain, with speculation rife in the German media as to who might succeed Hildebrand at the Gottlieb-Daimler-Stadion.

这位27岁的球星是否将前往西班牙还是未知数，德国媒体纷纷猜测谁将在格列布-戴姆勒球场延续希尔德布兰的荣耀

However, function of human homologous nitrilase protein was still unknown.

然而，在人类的同源蛋白中，其功能到现在仍是未知数。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。