【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】下列关于股票的说法正确的是()。
D.
优先股是股票最基本的形式,也是发行量最大、最为重要的股票
【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...
【简答题】任选两个任务编写对话 Task 1 : Ask for Mark’s comments on the weather. Task 2 : Ask about and describe the weather at this time of year. Task 3 : Ask Mr. Green about the weather condition tomorrow and plan an ac...
【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】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...