Secondly, the relevance feedback approach requires relevant documents to be similar to each other. That is, they should cluster. Ideally, the term distribution in all relevant documents will be similar to that in the documents marked by the users, while the term distribution in all nonrelevant documents will be different from those in relevant documents. Things will work well if all relevant documents are tightly clustered around a single prototype, or, at least, if there are different prototypes, if the relevant documents have significant vocabulary overlap, while similarities between relevant and nonrelevant documents are small.

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Aimed at the shortcomings of previous studies, this research constructs the system of primary school students' mathematics learning strategies, in which the using status, developmental traits and main influencing factors are investigated thoroughly. The processing mechanism of strategies is revealed both in psychological and physiological aspects through cognitive psychology and cognitive neuroscience methods. In order to promote children's strategy learning, the teaching method and effect are explored through the instructional experiment.

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In this thesis, I summarize the theoretical calculation method, applied scope and notice of siphonic drainage system, and point out the advantage of siphonic drainage system compared with gravitation drainage system. In the archetype experiment study of siphonic drainage tube, I adopt different tube diameter and different structural height to survey the drainage volume and press in different place. I observe various kinds of flow state, and get chief factors which influence hydraulic peculiarity of system as the tube diameter or structural height, and find out the relevance of factor to flux. I apply CFD Fluent software and adopt standard k-ε model and RNG k-ε model, then use finite volume method and second-order upwind scheme to discrete numerical model, while coupling numeration of velocity field and press is based on SIMPLE. In the numerical simulation of curved part of tube, siphonic drainage tube experiment system and multi-outlet siphonic drainage system, I make research on internal velocity and press of system in different project condition by changing the tube diameter of curved part, negative press value in tube export and improving the quantity of water gutter. This thesis first adopts a method of combining archetype experiment and numerical simulation to study the siphonic drainage system, test and verify the validity of experiment and numerical simulation, and makefurther study on system, it solves the problems of limited testing conditions, and has a logical results, it can provide a valid method for optimizing and designing the drainage tube-net system. The conclusion have referring value for study and design of siphonic drainage system.

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Therefore, depecage shall be adopted. The following rules are suggested: 1the existence, scope, duration and transferability of copyright and the unlawfulness in copyright infringement shall be governed by the law of the place where the works are effectively used. 2 Initial ownership of copyright works shall be governed by lex originis except works for fire, which should be governed by the laws that govern the employment contracts. 3 Contractual aspects of transfer of copyright through exploitation licenses or assignment should be governed by the laws chosen by the parties; in absence of choice, they shall be governed by the law of the country with which the contract is most closely connected (based on characteristic performance). 4 The legal consequences of the infringement shall be governed by the law expressly chosen by the parties; in absence of choice, it shall be governed by the law of common place of residence or main place of business; in absence of above common place, it shall be governed by the law of the country most closely connected.

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Much work has been done on multi-objective optimization methods to make them turn from deterministic searching algorithm to stochastic searching one, and from single objective optimizing method in nature to veritably vector optimization method. At present there are still many unsolved problems on it.

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The writer introduced briefly the load rating practices of Gears published by AGMA of the U.S. A in 1958, admitting that they are an advance in gear design for seores of years in U.S.

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Many claimed it could not be done, despite the examples of Korea, which managed the trick in the 15th century, and Vietnam which, like China, has a tonal language with many homonyms but switched successfully to an alphabetic system.

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Many claimed it could not be done, despite the examples of Korea, which managed the trick in the 15th century, and Vietnam which, like China, has a tonal language with many homonyms but switched successfully to an alphabetic system.

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