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【单选题】
当高聚物的相对分子质量足够大时，高聚物的黏流活化能随相对分子质量的增大而( )。A.
增大
B.
减小
C.
不变
D.
先增大后减小
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【简答题】阅读理解。 In cities with rent control, the city government sets the maximum rent that a landlord can charge for an apartment. Supporters of rent control argue that it protects people who are living in apa...
【简答题】In cities with rent control, the city government sets the maximum(highest) rent that a landlord can charge for an apartment. Supporters of rent control argue that it protects people who are living in ...
【单选题】Which of the following statements about the effects of rent control is correct?
A.
The short-run effect of rent control is a surplus of apartments, and the long-run effect of rent control is a shortage of apartments.
B.
The short-run effect of rent control is a relatively small shortage of apartments, and the long-run effect of rent control is a larger shortage of apartments.
C.
In the long run, rent control leads to a shortage of apartments, and the quality of available apartments is improved by rent control.
D.
The effects of rent control are very noticeable to the public in the short run, because the primary effects of rent control occur very quickly.
【简答题】阅读理解。 In cities with rent control, the city government sets the maximum rent that a landlord can charge for an apartment. Supporters of rent control argue that it protects people who are living in apa...
【单选题】Man must stop ______ the earth’s atmosphere.
A.
filling
B.
wasting
C.
polluting
D.
chew
【简答题】过点 ，在 轴上和 轴上的截距分别是 且满足 的直线方程为___ ___
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