[德阳一诊]2023届德阳市高中2020级第一次诊断考试文理 数学答案

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【答案】D【解析】将溶液稀释10倍，盐酸pH增大1，醋酸pH<5,A项错误。pH相等的溶液，c(CH3COOH)>c(HCI),与足量锌粒反应，醋酸生成H2的量多，B项错误。H相同的盐酸和醋酸中，加入锌粒开始反应速率一样大，但随着反应进行，醋酸中速率大于盐酸中的速率，故产生等量的氢气，醋酸用时少，C项错误。在盐酸中加入NOH溶液至中性时，水的电离程度逐渐增大；在醋酸中加入NaOH溶液至中性时，加入的n(NaOH)

Dear teachers and students,Today I'm going to give you a speech about how to deal with your anxiety.It is well known that when we are confused about something,we may feel anxious.Although we often feelanxious,we should find suitable ways to deal with anxiety.We should achieve a balance between schoolwork andhobbies.Try to plan your spare time well.Don't lose heart at any time.You will make great progress throughhard work.It's a good idea to use different kinds of music to change moods.If you worry a lot,you can listen to classicalmusic.You will feel relaxed.When having problems,you can ask people around you for help.It's not wise tokeep our anxiety to ourselves.