摘要：19．将氮气.一氧化碳.二氧化碳的混合气体先通过足量澄清的石灰水.再通过足量灼热的氧化铜.最后剩余气体是····························································································································· [ ] A．氮气 B．二氧化碳 C．一氧化碳 D．二氧化碳和氮气
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