题干

2007年诺贝尔化学奖授予善于做“表面文章”的德国科学家格哈德·埃特尔。他的成就之一是证实了气体在固体催化剂表面进行的反应,开创了表面化学的方法论。在汽车尾气净化装置里,气体在催化剂表面吸附与解吸作用的过程如图所示。下列说法错误的是

C:NO和O2必须在催化剂表面才能反应

A:汽车尾气的主要污染成分包括CO和NO

B:NO2是该过程的中间产物

D:该催化转化的总反应方程式为:2NO+O2+4CO 4CO2+N2

上一题 下一题 0.0难度 选择题 更新时间:2019-03-13 05:49:36

答案(点此获取答案解析)

C

同类题3

阅读下面文言文,按要求回答问题。

【甲】愚公移山(节选)

    太行、王屋二山,方七百里,高万仞。本在冀州之南,河阳之北。

    北山愚公者,年且九十,面山而居。惩山北之塞,出入之迂也,聚室而谋曰:“吾与汝毕力平险,指通豫南,达于汉阴,可乎?”杂然相许。其妻献疑曰:“以君之力,曾不能损魁父之丘,如太行、王屋何?且焉置土石?”杂曰:“投诸渤海之尾,隐土之北。”遂率子孙荷担者三夫,叩石垦壤,箕畚运于渤海之尾。邻人京城氏之孀妻有遗男,始龀,跳往助之。寒暑易节,始一反焉。

【乙】卖蒜老叟

    南阳杨二相公精于拳术,每至演武场传授枪棒,观者如堵。一日,有卖蒜叟,咳嗽不绝声,旁睨①而揶揄②之。杨大怒,招叟至前,以拳打砖墙,陷入尺许,傲之曰:“叟能如是乎?”叟曰:“君能打墙,不能打人。”杨骂曰:“老奴能受我打乎?打死勿怨!”叟笑曰:“垂死之年,能以一死成君之名,死亦何怨!”老人自缚于树,解衣露腹。杨故取势于十步外,奋拳击之。老人寂然无声,但见杨双膝跪地,叩头曰:“晚生知罪矣。”拔其拳已夹入老人腹中坚不可出。哀求良久,老人鼓腹纵之,已跌出一石桥外矣。老人徐徐负蒜而归,卒不肯告人姓氏。

【注】①睨:眼睛斜着看。②揶揄:出言嘲笑、讽刺。

同类题5

根据短文理解,从A、B、C、D四个选项中选择最佳答案填空。

    Be pleased to do anything even though it is very tiny. In fact, there's no single thing that is not worth doing or you are not able to do. So living a happy life with a light heart is the most important. A good mood decides your quality of life. Then 1 can you live a happy life?

    Make each day meaningful(有意义的)by helping someone or just making someone smile. The feeling which makes you want to help others 2 at the bottom of your heart. Happiness depends on your feelings in your heart. Helping others is helping yourself. By helping others, you 3 more. Seeing their satisfied smile will make you feel 4 of what you have done.

    Face difficulties bravely in your life. 5 may meet with difficulties. No one can avoid them. The difficulties can teach you a lot. They are your treasure. They will help you to be closer to 6 Focus on the good experiences you 7 in the past few years. Be grateful to life. Don't think too much about the negative things. They 8 bad weather. Bad weather will pass sooner or later, and so will the negative things. You may find many dead ends in your life, but you will 9 find your way out of them. Everything will get better at last.

    Never worry about the things you can't change. Worrying isn't useful. Worrying can 10 change the situation   11   solve any problem. Perhaps, not every dream will be realized; not every effort(努力 ) will be completed. Never mind, and take it easy.

    Come on, everybody! Let's live a happy life with a light heart and enjoy the beautiful sunshine every day.