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欲除去下列食物中混有的少量杂质（括号内为杂质），所选试剂正确的是

A、氮气（氧气）——木炭

B、氢氧化钠溶液（碳酸钠）——澄清石灰水

C、二氧化碳（一氧化碳）——氧气

D、氯化钾溶液（碳酸钾）——稀硫酸