查询词典 difficult problem

This problem is so difficult that only a few physic can work it out.

这个问题困难到只有一些医术可以解决它。

However, the ocular of hydraulic systems working condition is bad. It is difficult to obtain the parameter of hydraulic system. The fault of hydraulic system has pilosity nature, uncertainty and disguise. The fault sign and the fault reason of hydraulic system have complex non-linear mapping relations, therefore it cannot use the simple functional relation to describe. This has brought the difficulty for the classics fault diagnosis technology. The intelligent diagnosis technology base on ANN and ES can solove the above problem well and the diagnosis result is more accurate and reliable.

但是，液压系统工作状况直观性差，参数不易获取，故障具有多发性、不确定性和隐蔽性；液压系统故障征兆与故障原因之间存在复杂的非线性映射关系，不能用简单的函数关系来描述，给经典故障诊断技术带来了困难，而基于神经网络和专家系统的智能诊断技术很好的解决了上述问题，使诊断结果更加准确可靠。

The classical cutting stock algorithm——column generation technology , and wrap up rectangle technology for abnormity are analyzed ; The development of AutoCAD with ObjectARX is studied and the generating method of cutting outline drawing and layout drawing were found out on the basis of analyses of the graph database structure of AutoCAD and the basic operation of it ; The process planning technology of plate material cutting orienting numerical control is studied a process planning method directly based on layout drawing is established ; The emulation technology in AutoCAD is studied and a kind of dynamic emulation method is put forward , which is realized by incrementally modifying graph entity ; The postposition of NC program of the integrated cutting system constructed on software plug-in is proposed , which can effectively solve the problem that it is difficult for a numerical control programming system to be common , which is caused by the difference of instruction format and control parameter between different type of numerical control machine .

分析了经典的矩形件优化排样算法——列生成法和针对异形件的矩形包络算法；研究了基于ObjectARX 的AutoCAD 开发技术，结合对AutoCAD 图形数据库结构及其基本操作的分析，给出了下料轮廓图和排样图的生成方法；研究了板材数控下料加工的工艺处理技术，建立了一种直接基于排样图进行的图形交互工艺规划方法；研究了在AutoCAD环境中的板材下料数控仿真技术，给出一种通过增量修改图形实体对象实现的动态仿真方法；提出以软插件技术构建集成下料系统的数控编程后置处理部分，能够有效解决因数控下料机床指令格式及控制参数不统一导致的自动编程软件系统不易实现通用性的问题。

In recent years, the social postposition effect that enrols as college enlarge is highlighted, college graduate increases substantially, obtain employment difficult question already became social heat, obtain employment leads a problem to enter a college from socioeconomy domain, become a society gradually the focus of extensive controversy.

近年来，随着高校扩招的社会后置效应凸显，高校毕业生大幅度增加，就业难问题已成社会热点，就业率问题从社会经济领域进入高校，并渐成社会广泛争议的焦点。

If you have no problem in pronouncing, I think it will not be difficult for you to improve your English.

假如你的发音没有问题了，我想你的英语提高也不是很困难，你说呢？

Being a parent is a difficult job even for those who do not experience a psychiatric problem.

当一个家长是件困难的工作，即使是对于没有精神问题的人也一样。

How to measure exactly the coal mass of pulverizer in fossil power plant? It is one of primary causes that the efficiency of milling control is low and the automation is difficult to running. In this paper a method of solving uncertainty problem-evidential theory was studied principally from the view of the multiple sensor information fusion.

火电厂中钢球磨煤机筒内存煤量的测量问题一直是制粉控制效率低和自动控制难以投入运行的主要原因之一，本文从多传感器信息融合的角度出发，重点研究了一种解决不确定性问题的有力方法——证据理论方法。

To verify the performance of MCBA, we study two cases. The first case is a G/G/1 queuing problem with the optimal parameter setting difficult to determine. The second case has an additional binary decision variable representing two different dispatching rules. Compared with the results of Optimal Computing Budget Allocation, the proposed approach is observed to achieve higher probability of correct selection under the same simulation cost.

为了验证我们方法，我们用了两个例子，第一个例子是在G/G/1系统搜寻一组难以找到最佳参数的例子，第二个例子则是延续第一个例子，额外加进了另一个二元因子，代表不同的派工法则，跟另一个方法OCBA比较后，可以发现我们的方法能够获得较高的正确选择机率，在相同的模拟资源下。

Clever and quick-minded as he is,he also thought it difficult to solve the problem.

虽然他聪明机智，也觉得解决这个问题很难。

This problem is quite difficult for such a little boy.

对于这么小的孩子来说，这道题是相当难了。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。