研究现状：根据《中国餐饮报告》的数据，火锅占主要餐饮消费的20.3%以上，每年都在增长。在店面扩张速度方面，重庆增速最快。随着近年来火锅外卖概念的兴起，多方企业入局这一市场。以上数据参...

AbstractAlong with the progress of The Times,the continuous development of Internettechnology,people's life style has changed,at present,our country has graduallystepped into the i...

AbstractIn the process of vigorously promoting the joint construction of a community ofhuman and natural life,it is the pursuit of the transformation of traditional energyconsumpti...

AbstractIn recent years,the determination of Fermi energy levels in semiconductorsunder different conditions and the effect of defects in deep energy levels onluminous efficiency h...

The Application of Classified Discussion Thought in Mathematics of SeniorHigh School Entrance ExaminationAbstract This paper mainly studies the application of classified discussion...

定义2.1.2酉矩阵：若一个n×n阶的复数矩阵U满足U=AHA=E,其中矩阵E为n阶单位矩阵，AH为U的共轭转置，则称U为酉矩阵0，定义2.1.3对角矩阵：在矩阵中，如果除了主对角线，其它元素均满足等于0的条...

AbstractMathematics educator stolyard thinks:'mathematics activity is mathematicsthinking activity,the student's mathematics activity is the positive thinking activity inmathematic...

AbstractCauchy-Schwartz Inequality is one of the most important inequalities in mathematicalanalysis,which is widely used in many different fields.In this paper,several commonexpre...

AbstractToday,third-party payment has changed all aspects of people's work and life,butthere are also hidden dangers.In order to regulate the development of the third-partypayment ...

北京理工大学珠海学院2020届本科生毕业论文AbstractThe concept of 'sharing'emphasizes the 'sharing'of the fruits ofeconomic developmentby the whole society.With the economic developme...