用NA代表阿伏加德罗常数，下列说法正确的是
| A．0．2NA个CO分子在标准状况下的体积约是4．48 L |
| B．0．1mol/L BaCl2溶液中Cl﹣数目是0．2NA |
| C．4℃时，22．4 L水中含有的电子数目为10NA个 |
| D．使23g钠变为 Na+，需失去0．1NA个电子 |
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