速度：巴羅克風格時期演奏速度比較適度，既不太快，也不太慢，快、慢是相對的概念，不是絕對的概念 。

"巴羅克風格時期演奏速度比較適度，既不太快，也不太慢" - Not entirely aggreeable. Firstly, Baroque period, as you so naively put it, is a long period of time, you can't use one statement to summarize the style of 150 years - unless, of course, you are teaching a 3-year-old or you could only comprehend what a 3-year-old could comprehend...
"貝多芬的快板樂章比海頓、莫扎特又快的多" - also a problematic statement. Firstly, you were comparing Baroque and Classical in this paragraph, and Haydn, Mozart and Beethoven happened to be in the same period. Secondly, none of Mozart's or Haydn's work indicate metronome speed, and Beethoven only very rarely did (only Op. 106 comes to mind). The tempi largely depended upon the temperament of the performer. Thirdly, as Dr. Grove of Grove Encyclopedia pointed out, there were at least 10,000 composers in Vienna around 1800, and you can't just take Haydn, Mozart and Beethoven and make a comprehensive judgment on the common practice. In fact, even if Haydn, Mozart and Beethoven's works are marked faster or slower than Baroque tempi, they don't represent the tastes of the period - they were pioneers of their times, not representative of the popular taste of that period. Op. 106 was marked exceedingly fast by Beethoven, but it weren't performed widely (if at all) until years after Beethoven died.
"浪漫主義事情的速度幅度比古典時期又有較大的擴張." As Bart Simpson would say, "duh". (Meaning: you are simply stating the obvious without really making a point.)

You go hl_so! This sort of questions really deserves a serious beating with a belt! Auch! =P