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【单选题】
在我国晚育是指A.
男性30周岁，女性28周岁
B.
男性28周岁，女性26周岁
C.
男性24周岁，女性22周岁
D.
男性26周岁，女性24周岁
E.
男性25周岁，女性23周岁
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【简答题】与PC和ABS相比, PC/ABS合金性能上 有何特点?
【单选题】All speakers produce summaries of the sessions they gave. The speakers should write ______.
A.
a proposal for their session.
B.
a brief report about their session.
C.
full details of what is in their session.
【单选题】It can be inferred from the conversation that
A.
the two speakers are the student and the professor.
B.
the development of Iarge cities in the developing countries is not balanced.
C.
the large cities in the developing countries grew as rapidly as those in the developed countries.
D.
it's easy to solve the problems of the large cities.
【简答题】PC/ABS合金性能上与PC和ABS相比,有何特点?
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