你的这个题目和内容一看就太汉语化了，写的都是官话，有些词汉语可以搭配，英文就不能搭配了，有些内容翻译起来其实一个词就可以搞定了，所以可能会有些修改，希望对你有所帮助。 Title:Research on changing the preconceptions of combustion for senior three students Abstract: Considerable teaching practice and researches on chemistry show that students have form their attitudes and concepts towards things and phenomena from daily life before they star their chemistry course.These preconceptions which add difficulties to changing the students' concepts impress deeply in the mind of the students and often exist with scientific concepts.As a result, it is important to design the correct 熄灯断网了要。。。有空再翻译。。。

Topic: theory PiPaQu "house of flying daggers" techniques used Abstract: bai juyi in the pipa has said: "the big string as torrential rains travel travel, small chord. CaoCaoQieQie du earnestly like whispers play, a jade plate pearls." This sentence is soft hand in hand with praise pipa tone, and PiPaQu wonderful "house of flying daggers" is the charm of classic, pipa in this music was also show incisively and vividly. This paper PiPaQu "house of flying daggers" and its special the basic performance techniques is analyzed, and through playing techniques to its historical introduction, musical characteristics, use the technique three aspects expounded comprehensively, fully understand the music playing techniques involved, facilitate improve performance level and enhance piece of music of expression. Keywords: house of flying daggers; Art characteristic; Playing techniques