A:16O→18O的转化属于化学变化
B:除去溴苯中的溴,可用稀NaOH溶液反复洗涤,并用分液漏斗分液
C:冶金厂常用高压电除去烟尘,是因为胶体带电荷
D:少量Cu将足量浓、稀硝酸分别还原为NO2和NO,其转移电子数之比为1:3
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