海水中含有MgCl2，从海水中提取镁，正确的方法是
A．海水 Mg(OH)2 Mg |
B．海水 MgCl2溶液→ MgCl2（熔融）Mg |
C．海水 Mg(OH)2 MgOMg |
| D．海水Mg(OH)2MgCl2溶液 → MgCl2（熔融）Mg |
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