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【单选题】
N A 表示加德罗常数，下列判断正确的是 [     ]
A.
在18g 18 O 2 中含有N A 个氧原子
B.
标准状况下，22.4 L空气含有N A 个单质分子
C.
l mol C1 2 参加反应转移电子数一定为2N A
D.
含N A 个Na + 的Na 2 O溶解于lL水中，Na + 的物质的量浓度为1 moI/L
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