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【简答题】
何为刚性防水屋面？刚性防水屋面有哪些构造层？各层做法如何？注意为什么要设隔离层？
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皮皮学刷刷变学霸
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【单选题】已知集合A='{1,' 2, 3, 4}，函数f(x)的定义域、值域都是A，且对于任意 ， ，设 1 , 2 , 3 , 4 是1，2，3，4的任意一个排列，定义数表 ，若两个数表的对应位置上至少有一个数不同，就说这是两张不同的数表，那么满足条件的不同的数表的张数为（ ）
A.
216
B.
108
C.
48
D.
24
【单选题】What is one of the 4 great inventions of modern China?
A.
printing
B.
gunpowder
C.
compass
D.
Online shopping
【简答题】Todays policemen in large cities throughout the world rely on modern inventions to help them in their work. In most places motor scooters and police patrol cars have done away with the need to patrol ...
【多选题】What are the four great new inventions in modern China?
A.
Alipay
B.
Internet shopping
C.
High-speed rail
D.
share-bikes
【单选题】People living in modern times benefit from many discoveries and inventions that have _________the world.
A.
filled
B.
stuffed
C.
enriched
D.
extended
【简答题】发音器官包括三大部分: A. _______________ 、 B. _________________ 、 C_______________ 。
【简答题】Modern inventions have speeded up people's lives amazingly．Motor cars cover a hundred miles in lithe more than an hour，aircraft cross the world inside a day，while computers operate at lightning speed．...
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