問題詳情
2 .承上題，氧和鎂化合的質量比為多少？
(A)1：2
(B)2：1
(C)3：2
(D)2：3。
(A)1：2
(B)2：1
(C)3：2
(D)2：3。
參考答案
答案：D
難度：計算中-1
書單：沒有書單，新增
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