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【单选题】
设N A 表示加德罗常数的值，下列说法正确的是 [     ]
A.
电解精炼铜时，阳极质量每减少32 g，阴极上生成Cu的原子数约为3.01×10 23
B.
标准状况下，22.4 L NO和11.2 L氧气的混合气体中原子总数为3N A ，分子总数约为1.5N A
C.
14 g N 60 单质（见上图）中含有N-N键的数目为3N A
D.
1 mol Na 2 CO 3 晶体中含有的阴离子数为N A
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