Originally posted by 阿之 at 2005-4-11 22:23:
chem:燃燒三角指邊三個?
Originally posted by 阿之 at 2005-4-11 10:23 PM:
希望有人幫我解答
Phy:坐太空船時,加重馬力,速度沒有增加,反而太空船愈來愈重,為什麼?
chem:化學物品上的易燃標籤,助燃標籤係唔係一樣?有咩野不一樣?
chem:燃燒三角指邊三個?
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