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【简答题】
精馏操作中精馏塔的温度从上到下逐渐 ,塔内难挥发组分的浓度从下到上逐渐 。(升高或降低或不变)。
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【单选题】It can be inferred from the passage that ______.
A.
the energy crisis is similar to the natural disasters we had in the past
B.
the problem of energy is the most serious problem our country is confronted with
C.
the author is uninterested in the problems of our society
D.
the author is particularly worried about the crises we are facing
【单选题】It is implied in the text it is hard to______．
A.
carry life learning through
B.
tell the nature of life learning
C.
learn without going to school
D.
find a specially trained teacher
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