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【单选题】
汽车尾气(含有烃类、CO、SO 2 与NO等物质)是城市空气的污染源。治理的方法之一是在汽车的排气管上装一个“催化转换器”(用铂、钯合金作催化剂),它的特点是使CO与NO反应,生成可参与大气生态环境循环的无毒气体,并促使烃类充分燃烧及SO 2 的转化。 (1)写出CO与NO反应的化学方程式:_____________________________。 (2)“催化转换器”的缺点是在一定程度上提高了空气的酸度,其原因是___________________。 (3)控制城市污染源的方法可以有________。A.
开发氢能源
B.
使用电动车
C.
植树造林
D.
戴上呼吸面具
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【简答题】常见架空线路的常见故障有哪些?
【简答题】常见的特种光缆常见的有哪几种？
【多选题】In colonial times women provided health care for their families and neighbors. Doctors were often not __1__ , and at that time they had not learned to cure many of the illnesses that we often go to a ...
A.
also
B.
currently
C.
delivering
D.
treat
E.
readily
F.
reduced
G.
cure
H.
regulate
I.
male
J.
available K. female L. schooling M. accepting N. approachable O. declined
【简答题】呕血最常见的病因是____，咯血最常见的病因是____。
【简答题】In colonial times women provided health care for their families and neighbors. Doctors were often not __1__ , and at that time they had not learned to cure many of the illnesses that we often go to a ...
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