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【单选题】
设 N A 为加德罗常数值，下列说法中正确的是（   ）
A.
氧化还原反应中，若消耗7.1g Cl 2 ，必转移0.2 N A 个电子
B.
将1.0molFeCl 3 全部制成胶体，其中氢氧化铁胶粒为 N A 个
C.
12g NaHSO 4 在熔融时离子总数为0.3 N A
D.
标准状况下，11.2L氦气所含的原子数为0.5 N A
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