Anonymous asked in 教育及參考書小學及中學教育 · 1 decade ago


we should not leave the blue flame of a bunsen burner unattended because

a.the flame is noisy

b.someone may not see the flame and burn himeself/herself produces soot and a bad smell

d.striking back may happen due to the opened air hole

4 Answers

  • 1 decade ago
    Favorite Answer


  • 1 decade ago

    有藍火是因為燃燒良好, 因此c是不正確



    a記得不是, 但不肯定

  • ?
    Lv 5
    1 decade ago

    The most important point is b !

    Because somebody has touch it, it will hurt the him.

    So I think the answer is b !

    2007-10-26 18:53:17 補充:

    Sorry !!!!!!!!!!!!!!!!I think type a extra word.' The ' !!!!!!!!!!!!!!!當它沒存在 。

    Source(s): Me
  • 1 decade ago

    It should be B and D......

    Source(s): ME
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