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【单选题】
Why was University Tower torn down?A.
Because a bell tower was to the built on the site.
B.
Because it was found unsafe.
C.
Because a parking lot was to be constructed there.
D.
Because no one wanted to preserve it.
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【简答题】We don't know if there is a limit
【单选题】If there is a will, there is a way to get the trouble ______.
A.
on
B.
down
C.
through
D.
for
【简答题】A binary adjacency ( ) is a set of cells containing a 0 if there is no connection between two people and a 1 if there is a connection.
【单选题】The () of a protective relay is that it must operate correctly if there is a fault and must not operate if there is no fault.
A.
sensitivity
B.
selectivity
C.
rapidity
D.
reliability
【单选题】铜的摩尔质量为M g/mol，密度为d g/cm 3 ,阿伏加德罗常数为NA，下列说法正确的是（ ）。
A.
1 kg铜所含原子的数目为d NA
B.
一个铜原子所占有的体积为（M/d）NAcm3
C.
一个铜原子的质量为M/NAg
D.
1 dm 3 铜所含有的原子数为 d NA/M
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