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Security & protection
Related to services concerned with the conception, production and implementation of security and protection systems.
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化學平衡
Chemistry; General chemistry
反應物和產品的濃度,有的國家尚未更改的時間,結果時,轉發的反應進行逆向反應率相同。的正向和反向反應率通常不為零,但反應物和產品的濃度相等,有沒有淨變化的反應。 ...