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Category: 化學類

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化學是在原子、分子層次上研究物質的組成、結構、性質以及變化規律的科學。化學研究的對象涉及物質之間的相互關係，或物質和能量之間的關聯。傳統的化學常常都是關於兩種或以上的物質之間的接觸和其後的變化，即化...