问题 多项选择题

纸胎基油毡防水层的缺点有()。

A.抗拉强度及塑性较低

B.吸水率较小

C.透水性较差

D.原纸的原料来源困难

E.易腐烂、耐久性较差

答案

参考答案:A, D, E

解析:纸胎基油毡防水层的缺点有:抗拉强度及塑性较低,吸水率较大,不透水性较差,并且原纸由植物纤维制成,易腐烂、耐久性较差。此外,原纸的原料来源也较困难。

完形填空
完形填空。
     Brandon Keefe was in the third grade when he decided to make a difference. One afternoon at a parent-teacher meeting to   1   building a library for a children's home, Brandon heard   2   difficult it was to get books. And he thought he might have a good   3  . Many people have books that they don't like to read any more, so   4   give those books to kids who need them?
     To help those kids who   5  . books to read, Brandon Keefe started an organization (组织)-Book Ends. The organization has   6   76 000 books to children in need, and built 23   7  . 19 more libraries are being built.   8   will help more than 33 000 poor kids.
     "So many people helped me do the work   9   the organization. And the reaction (反映) of the people we helped makes me work  10  to help more people," Brandon Keefe said.
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