
常識
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elemental XY
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1
常識(第一課)
學多啲,識多啲
2
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為什麼蓮藕會有洞?
一、植物有呼吸作用,蓮藕長在淤泥中沒辦法接觸空氣,這些孔洞和葉柄裡的孔洞相通,蓮藕為了呼吸,為了進行氣體的交換,好讓自己維持正常的新陳代謝,所以演化出多孔多洞的構造,使得有限的空氣能夠在整個地下莖裡流通,也使每一個細胞都能得到氧氣的供應,有助於空氣和水氣的流通。
6
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7
鐵鏽是什麼?
鐵鏽為鐵氧化物的統稱,通常為紅色,由鐵和氧氣境下進行氧化還原反應而生成。不同情況下會生成不同形式的鐵鏽。[1]鐵鏽主要由三氧化二鐵水合物Fe2O3·nH2O和氫氧化鐵(FeO(OH), Fe(OH)3)組成。其他金屬亦會被氧化,但是通常不稱為「鏽」。足夠的時間後,在氧氣和水充足的情況下,鐵會完全氧化成鏽。鋁的氧化非常緩慢,因為氧氣在鋁的表面生成了一層緻密的氧化鋁薄膜,此反應稱為鈍化。
常識(第一課)
學多啲,識多啲
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