氧气和二氧化碳哪个比较美？
冷指数：零下99度
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氧气，因为氧气美女？
ReplyDeleteThe answer correct. but the explanation is wrong.not so easy lar...hehe..
ReplyDelete哈哈。。。又在google找到了。
ReplyDelete因为氧气助燃 :))
因为氧气会助燃，“自然”比较美。
ReplyDelete