【简答题】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: _____________________________ ...
【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...
【单选题】股票往往是投资者重点关注的对象,下列关于股票的说法,不正确的是( )。
【简答题】Booking a passage is just like 1 (book) an airplane ticket. The travelers can go to the 2 (agency) or just telephone them to book a passage. As traveling by sea is greatly 3 (influence) by the weather...
【简答题】Passage 4 Climate change is not just a change in the (1) ____________ temperature; it is also a change in the weather. Scientists say we can expect more extreme weather s along with some areas s...
【多选题】下列关于股票的说法不正确的是( )。
B.
无面值股票中载明所占公司股本总额的比例或股份数
C.
B股是以外币标明票面金额,以外币认购和交易的股票
【简答题】In the 21st century,clouds and stormy weather no longer automatically bring military operations to a halt or force a change in targets. Techonologies such as the Global Positioning System now 1 cruise...
【简答题】Read the following paragraph and identify its main idea by filling in the blank. 1 Creatures that are very sensitive to the changes in the air before a storm can “predict” a change in the weather. 2 B...