问题
问答题
金属熔炼的目的是什么？
答案
参考答案：
金属熔炼的目的是要获得预定成分和一定温度的金属液，并尽量减少金属液中的气体和夹杂物。
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金属熔炼的目的是什么？
参考答案：
金属熔炼的目的是要获得预定成分和一定温度的金属液，并尽量减少金属液中的气体和夹杂物。
Having written a book on rock music and a book on jazz music, and now writing a book __31__ the classical music of the 20th century, I felt the __32__ to put somewhere the music that does not quite fit __33__ of these kinds of music. I also felt that I needed to research the beginning of the popular music in Western Europe and the USA in order to __34__ understand the change of the jazz and rock music. I also felt that ethnic music has become so __35__ that one should research the development from Western European and USA music. This book aims at __36__ all these gaps (差异). I did my best to give it a systematic feeling, although it is clear that musicians from such different parts of the world had very __37__ in common. Only after the joining together of the 1907s can we __38__ of a worldwide history of popular music. This book is about the __39__ of that formation (形成). It was not very difficult to decide how to __40__ jazz music from pop music. It was much more __41__ to decide how to separate rock music __42__ the rest of popular music, because rock music has taken in just about everything. Pieces of this book were firstly written for my 2003 books on rock music. __43__ that happened after the 1960s will be in the book on rock music. The __44__ is that you should read this book first, then the __45__ of jazz music and the history of rock music.
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