题干

汽车尾气(含有碳氢化合物、CO、SO2、NOx等物质)是城市空气的主要污染源,治理的方法之一是在汽车的排气管上安装催化转换器(用铂、钯合金作催化剂)。它能使CO与NOx反应生成可参与大气生态循环的无毒气体,并促使碳氢化合物充分燃烧及SO2的进一步氧化,下列说法中错误的是

A:CO与NOx反应的化学方程式是:2x CO + 2 NOx =' 2x' CO2 + N2

B:CO与NOx反应中还原剂为NOx

C:安装催化转换器处理汽车尾气的缺点是在一定程度上提高了空气的酸度

D:汽车改用天然气或氢气为燃料,都会减少对空气的污染

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答案(点此获取答案解析)

B

同类题5

阅读短文,完成下列问题。

    In her outstanding book, “Choose the Happiness Habit”, Pam Golden wrote, “Take the story of two twin brothers for example. One grew up and became an alcoholic (酒鬼), while the other became a successful businessman. When asked why he became an alcoholic, the alcoholic replied, “Because my father was a drunk.” However, the successful businessman's answer was also “Because my father was a drunk.” when asked why he succeeded. The same background. The same upbringing (培养). However, the results were quite different. Why? The reason is that they had different choices. The brothers chose different thoughts which formed the situations they found themselves in at last, so they had different experiences.

    There was a time in my life when I thought difficulty was due to “bad luck”. Have you ever heard the saying “When it rains, it pours”? That was my answer when others asked me how things were going on when I was in trouble. So what do you think I got? “RAIN”. More and more “RAIN”. I couldn't understand why bad luck was always with me.

    Pam Golden says, “You're either living in the problem or you're living in the solution.” Now, when I'm faced with what I used to think was a negative (消极的) situation, I use a different way to think about it. I force myself to replace those negative thoughts that make me lose heart in my mind with positive thoughts which encourage me to fight against the difficulty bravely. Sometimes I write down some ideas that may be a solution, which I combine with the lessons I have learned from the bad situations and the difficulties that troubled me in the past, and often, I find a solution to the problem soon. It seems that I should thank the difficulty I met with. The RAIN that poured in my world has become great experiences that provide me with valuable experience, from which I can benefit.

    Now, it doesn't “rain” as much in my life as it used to. In fact, most days are beautiful, cloudless and sunny! Sometimes I do get a rain, but I think it makes me stronger just like the rain helps plants grow up.