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【多选题】
关于发动机排放控制装置,下列说法哪些正确?A.
PCV阀的作用是确保曲轴箱通风正常进行，以便保持曲轴箱清洁和适当压力。
B.
EGR系统可以将部分废气引致燃烧室，以降低NOx排放。
C.
TWC装置可以将CO、SO2、NOx转化为CO2、H2O和N2。
D.
曲轴箱强制通风装置失效可能导致烧机油。
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举一反三
【单选题】The phenomenon illustrated by the appointment of Gus Wenner _______ .
A.
stops people from dreaming the American dream
B.
encourages the government to carry out public policies
C.
reduces the level of people’s tolerance of economic inequality
D.
narrows the possibilities of people at the bottom moving upward
【单选题】The people had to leave the region of New Mexico because______.
A.
they had cut down all the trees
B.
there were many trees there
C.
they had no water
D.
bad weather stopped the growth of trees
【单选题】Which of the following is TRUE according to the first paragraph?
A.
Mexico has stepped into an aging society.
B.
It is not necessary for Mexico to control its population.
C.
Mexico population is younger than that of developed countries.
D.
It is not necessary for Mexico to develop its infrastructure.
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