根据海水综合利用的工艺流程图，判断下列说法正确的是
（ ）
已知：MgCl2·6H2O受热生成Mg（OH）Cl和HCl气体等。
| A．过程①的提纯是物理过程，过程②通过氧化还原反应可产生2种单质 |
| B．在过程③中将MgCl2·6H2O灼烧即可制得无水MgCl2 |
| C．过程⑤反应后溶液呈强酸性，生产中需解决其对设备的腐蚀问题 |
| D．在过程④、⑥反应中每氧化0.2 mol Br-需消耗2. 24 L Cl2 |
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| A．said | B．to say | C．saying | D．being said |
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