题目: 将一定体积的稀硝酸平均分成两份,一份与足量铜粉反应收集到气体的体积为Vl;另一份先加入与其等体积的稀硫酸,再投入足量的铜粉收集到气体的体积为V2(Vl和V2都在同一条件下测定).下列说法正确的是( )A.V2=V1,气体成分相同B.V2>V1,气体成分不同C.V2>V1,气体成分相同D.Vl和V2的大小无法比较 答案: 答案:C
题型:选择题 — In order to improve your English, you need to practice more.— ______. Practice makes perfect.A.Certainly, go aheadB.Well, it dependsC.I don’t think so.D.I couldn’t agree more 查看答案