要证明一氯甲烷中氯元素的存在可以进行如下操作，其中顺序正确的是
①加入AgNO3溶液②加入NaOH溶液③加热④加蒸馏水⑤冷却后加入HNO3后酸化 ⑥加入NaOH的乙醇溶液
| A．④③①⑤ | B．②③⑤① | C．④③① | D．⑥③⑤① |
相关试题
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| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
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