The educational technology has the very intense practical orientation, but because this practical orientation is too powerful, it causes the researchers of educational technology can be unable to stop to think some basic theory questions, and be far away from asking educational technology some ultimate questions about educational technology. So it has caused that afer semicentennial developing educational technology still exit some questions such as confusing, the reality helpless, deficient theory, although it has obtained many encouraging performance, but it is unsuitable that educational technology is the commanding point of education reform and the breach status. Facing these conditions, educational technology needs carry on reviewing and looking up in historical and reality multiple field, needs integrate and conclude for obtained studying results, needs reflect on own level, and need to have the big breakthrough in the discipline elementary theory construction.

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This essay takes it as the starting point a macroscopic and microscopic analysis of the factors in the staff drain from the angle of human resource development and management and further gives an evaluation of the major impacts on the hotel and the employees as a result of the staff drain. On the basis of a scientific analysis of the staff drafr cost, the expectation, attitude an...

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Chapter two reviews the literature in this field. Chapter three and four point out the problems existing in our country's loan-loss provision accounting policy and practice. Chapter five to chapter eight systematically review the experiences of amphibolous, debate, conflict and harmonize process of ALLL standards in America since 1975, as well as the latest dynamics on the measurement model of loan asset. The problems, experience and lessons of the whole process are analyzed from the professional perspectives of accounting recognition, measurement and disclosure. Chapter nine gives some suggestions to our country's loan-loss provision accounting policy based on the American experience. Chapter ten concludes.

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From the perspective of hotels and on the basis of previous studies, this thesis makes "relationship quality" as initial variable,"voluntary behavior of the distributors" as mesne variable, to study the "performance of the hotel" on the logic of relationship among them with the relationship marketing theory as the starting point.

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This paper studied the grinding mechanism of this new type superalloy on the base of systematical analysis of variable characteristics of the grinding force, grinding temperature, topography of ground surface, residual stress distribution and hardness distribution of surface layer, as well as morphology of surface layer from a metallographical point.

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Firstly this paper analyses and compares to the methods of target tracking and telemetry in common use, selects and uses the telemetry system that called'reversed GPS', aiming at the difficulties and challenge of ball cartridge examination and reclaim in these circs that the falling point distribution is random and wide extension, or deviates from the Hpredetermined ballistic trajectory and falling on the midway because of multi-target and long-distance aviation in experimental aviation based on traditional radio directional bearing.

結(jié)合課題研究背景www.大色网.com，本文首先分析和比較了目前常用目標跟蹤和定位方法的優(yōu)缺點以及針對傳統(tǒng)無線電定位技術(shù)在做飛行測試試驗時由于目標飛行距離遠黄色免费强奸视频网站、目標數(shù)量多導致的目標落點隨機散布、范圍廣和偏離預定彈道视频高清国产在线观看网站下载安装、中途墜落等情況下給實彈試驗測試和試驗彈回收帶來的困難與挑戰(zhàn)夜夜大片网，選用了&倒GPS&遙測系統(tǒng)作為測試測量方案。

Modeling and stability analysis problem of linear switched system are emphasized in this part and main results include:(1) Through investigation in the projection of 〓 on x, where x denotes continuous state vector, a series of sufficient conditions for stability, asymptotic stability and unstability of linear switched system's equilibrium in the sense of Lyapunov are achieved. And also, a sufficient and necessary condition for state bounded stability of linear switched system is received.(2) For a class of periodical linear switched system whose switching sets are a group of ordinal lines starting from the original point, it's proved that state bounded stability can be defined by the running characteristic in a single period (3) Based on linear switched system, the concept of linear switched system network is put forward. Linear switched system network is a complex network interconnected by many linear switched systems.

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