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This paper presents a N-R method of acquiring multi-level reasoning production rules automatically based on NN, so as to resolve the bottle neckproblem in building a knowledge - based system-knowledge acquisition. This methodadopts a characteristic NN structure model and corresponding learning algorithm, so thatN -R method can fix the number of hidden nodes dynamically and form new conceptswhich are not defined in the sample set in the course of learning. Having been trained, NNis transforme...

本文为解决知识系统构造过程中的瓶颈问题──知识获取，提出了一种基于神经网络NN的自动获取多级推理产生式规则的N－R方法，该方法采用了特有的NN结构模型和相应的学习算法，使得NN在学习过程中动态确定隐层节点数的同时，也产生了样例集中没有定义的新概念，学习后的NN能用本文提出的转换算法转换成推理网络，最终方便地得到产生式规则集

The socialist countries have accumulated some rich experiences in the course of their development along with advancahility and tortuosity, which is the precious wealth for socialist countries to develop soundly in the 21st centun .

进入新世纪，知识经济、全球化及当代资本主义的新变化构成了21世纪社会主义存在与发展的外在环境，给社会主义的发展赋予了新的机遇和挑战，从而不可避免地对社会主义运动产生重大影响。

This paper describes about China's current power PF455S imported from South Korea, the main principles of rice transplanter, features and performance, as well as appear in the course of China's land planted with differences in environmental problems, and this issue was examined and put forward some solutions.

本文主要介绍了有关当前中国从韩国引进的PF455S动力插秧机的主要原理，特征和性能，以及在使用过程中出现的与中国土地种植环境的差异而出现的问题，并对此问题，作了研究，提出了一些解决方案。

Cardinal principle about present PF455S power Rice transplanter introduced from Korea S. of China of main introduction of this text, Characteristic and performance, and appear in the course of using plant problem that difference appear of environment with Chinese land, And this question, have been studied, has put forward some solutions.

摘 要本文主要介绍了有关当前中国从韩国引进的PF455S动力插秧机的主要原理，特征和性能，以及在使用过程中出现的与中国土地种植环境的差异而出现的问题，比如说：并对此问题，作了研究，提出了一些解决方案。

Cardinal principle about present PF455S power Rice transplanter introduced from Korea S. of China of main introduction of this text, Characteristic and performance, and appear in the course of using plant problem that difference appear of environment with Chinese land, And this question, have been studied, has put forward some solutions.

本文主要介绍了有关当前中国从韩国引进的PF455S动力插秧机的主要原理，特征和性能，以及在使用过程中出现的与中国土地种植环境的差异而出现的问题，比如说：并对此问题，作了研究，提出了一些解决方案。

Cardinal principle about present PF455S power Rice transplanter introduced from of China of main introduction of this text, Characteristic and performance, and appear in the course of using plant problem that difference appear of environment with Chinese land, And this question, have been studied, has put forward some solutions.

本次毕业课题设计详细介绍了中国引进的PF455S动力插秧机的主要原理，特征和性能，以及在使用过程中出现的与中国土地种植环境的差异而出现的问题，比如说：并对此问题，作了研究，提出了一些解决方案。

Cardinal principle about present PF455S power Rice transplanter introduced from Korea S. of China of main introduction of this text, Characteristic and performance, and appear in the course of using plant problem that difference appear of environment with Chinese land, And this question, have been studied, has put forward some solutions.

摘 要：本文主要介绍了有关当前中国从韩国引进的PF455S动力插秧机的主要原理，特征和性能，以及在使用过程中出现的与中国土地种植环境的差异而出现的问题，比如说：并对此问题，作了研究，提出了一些解决方案。

In the course of present investigation in interspecific hybrid of Tritical crops, cytomixis mas observed at microspore stage, the present investigation deals with detailed analysis of this phenomenon at different conditions.

作者在麦类远缘杂种的减数分裂过程中发现，在减数分裂Ⅰ的前期和小孢子时期均存在核穿壁的现象，并对各种状态下的穿壁现象进行了详细的观察研究。

Undoubtfully, in the course of oversea travelling, travelers will encounter some different customs and traditions that they used to be unfamiliar with.

毫无疑问，在到其他国家旅行的过程中，旅游者会碰到一些过去不熟悉的文化和传统。

Sensible of a benignant persistent ache in his footsoles he extended his foot to one side and observed the creases , protuberances and salient points caused by foot pressure in the course of walking repeatedly in several different directions , then , inclined , he disnoded the laceknots , unhooked and loosened the laces , took off each of his two boots for the second time , detached the partially moistened right sock through the fore part of which the nail of his great toe had again effracted , raised his right foot and , having unhooked a purple elastic sock suspender , took off his right sock , placed his unclothed right foot on the margin of the seat of his chair , picked at and gently lacerated the protruding part of the great toenail , raised the part lacerated to his nostrils and inhaled the odour of the quick , then with satisfaction threw away the lacerated unguinal fragment

随后他弯下身去，解起打成结子的靴带：先掰搭钩，松开靴带，再一次一只只地脱下靴子235 。右边那只短袜湿了一部分，大脚趾甲又把前面捅破并伸了出去，这下于便跟靴子分开了。他抬起右脚，摘下紫色的松紧袜带后，扒下右面那只袜子，将赤着的右脚放在椅屉儿上，用手指去撕扯长得挺长的大拇脚趾甲，并轻轻地把它拽掉，还举至到鼻子那儿，嗅嗅自己肉体的气味，然后就心满意足地丢掉从趾甲上扯下来的这一碎片。

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。