难题

At present the main research and the application public key the system crypto-algorithm has two kinds: The RSA algorithm and the ECC algorithm, former based on the great divisor of integers decomposition difficult problem, latter is separated the logarithmic computation difficult problem based on the elliptic curve in.

目前主要研究和应用的公开密钥系统的密码算法有两种：RSA算法和ECC算法，前者基于大整数因子分解难题，后者基于椭圆曲线上离散对数计算难题。

This theory emerged from those philosophical and logical inquires Russell made in his early stage, when Russell use logical analysis to solve the semantics problem his meaning theory suffered. The foundation of the theory of descriptions is a theory of meaning, as this thesis presents, and its central notion includes two syntax rules. Based on the first order predicates calculus, this theory seems successfully solve some notable semantics problems and then assures Russell's denotation theory.

本文认为，摹状词理论有深刻的哲学渊源，它脱胎于罗素早期的哲学和逻辑研究，直接缘起于罗素想要利用逻辑的分析方法去解决意义指谓论所面临的语义学难题；摹状词理论的基础是它的意义理论，核心是两个句法规则，它基于带等词的一阶谓词演算成功地解决了一些著名的语义学难题，维护了直观的指谓论，从而产生了巨大而深刻的哲学影响。

You know, people have hang-ups and that's my hang-up.

你知道，人都会遇到难题，而这就是我的难题。

since 1905 modern physics began leave the law of "two indestructibility", though it can be reply seem puzzle, but let basic theory sink into error region yet, hence arise new puzzle, now urgently base on respect to natural law and serious analysis "return to the right way", to recover proper position of these two natural laws.

提要 现代物理学自1905年开始离开了"两个不灭"规律，虽然回答了几道难题，但也基础使理论陷入误域，于是出现了新的难题，当今，亟宜在尊重自然规律和认真分析的基础上"重归正道"，恢复这两条自然规律的应有地位。

Aim at the special structure form for the first time used of the long span space truss and cross inhaul cable of the Guangzhou gymnasium light steel roof, supply the theoretical basis for the construction, therefore, improved feasibility and advanced nature of construction scheme greatly, and gained very good economic and social benefit.

5针对广州体育馆大跨度空间桁架+交叉支撑拉索轻型钢结构屋盖这一国内首次使用的结构形式，加之构件几何尺寸细小、刚度小、稳定性差，安装和拆除过程中各工况内力变化复杂且相互影响的技术难题，运用虚拟建造技术对施工方案中八大难题进行仿真分析，为实际施工提供科学的理论依据，大大提高了施工方案的可行性和先进性，取得了很好的经济和社会效益。

To solve this technology difficult problem, the course such as center of technology of plum steel company, ironworks experiment of more th......

为解决这个技术难题，梅钢公司技术中心、炼铁厂等经过。。。。。。关键词：热风炉基底技术难题热风炉，基底，材料

Our country firstly put forward such design principle of Qinghai-Tibet railway engineering as "lower temperature actively, reduce the heat into the subsoil, and assure the heat stability of frozen earth for the quality stability of construction", creatively adopt such corresponding measures of frozen earth construction problem as: for the poor frozen earth developing section, line should avoid as possible;for the geology of ice at high temperature and unstable frozen earth zone, the method of bridge instead of subgrade shall be adopted;in subgradeconstruction, such facilities as heat stick, rubble ventilation subgrade , rubble ventilation berm, ventilation pipe subgrade and laying heat preservation board etc shall be adopted to raise the stability of frozen earth subgrade;during the excavation of bridge, culvert , foundation pit and scouring prevention trough, creatively adopt single-tooth knapper and solve the problem of frozen earth excavation;during the construction of bridge and culvert, durable concrete and three-step maintenance method are adopted to assure the outside and inside beauty of structure.

我国在世界上首次提出"主动降温、减少传入地基土的热量、保证多年冻土的热稳定性，从而保证修筑在上面的工程质量的稳定性"的青藏铁路工程设计原则，创造性地采取了解决冻土施工难题的相应对策：对于不良冻土现象发育地段、线路尽量绕避；对于高温极不稳定冻土区的高含冰量地质，采取"以桥代路"的办法；在路基施工中采用了热棒、片石通风路基、片石通风护道、通风管路基、铺设保温板等多项设施，提高冻土路基的稳定性；在桥涵基坑、挡水埝基槽开挖中，创造性地应用了单齿破碎器，解决了冻土开挖难题；在桥涵工程施工中，采用了耐久性混凝土，采用了三步养生法，保证了结构物内实外美。

He has written 15 books of lateral thinking puzzles and hosts the lateral puzzles forum.

他写了15本关于水思考难题的书，并主办了水平思考难题论坛。

To deal with the difficult problem that 2000 ton coal liquescence reactors are hoisted when they are produced or made up,2000 ton assembled gantry crane is studied.

为解决国内化工行业重达 2 0 0 0t煤炭液化反应器的现场制造、安装等工程中的起重技术难题，对 2 0 0 0t拼装式龙门吊机进行了研究，优化主体结构，研制先进的台车走行、电气控制系统，使其性能优、投资省，为解决超大吨位设备的整体制造、安装难题提供有效的途径。

At the same time, the problem of magic square is a typical NP problem, and there are still lots of unresolved puzzle and unfathomed mystery because of the complexity today.

但是，幻方问题是一个典型的 NP 难题，由于问题的复杂性，至今仍有很多未解决的难题和不解之谜。

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。