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【简答题】
Cars in America Americans love cars and use them a lot. Cars are so much part of life that they make the United States a nation on wheels. Cars are not only popular but also necessary in the United States. There are three main reasons why the car becomes so popular in the United States. First, cars provide the most comfortable and cheapest form of transportation. Second, very few people use buses and trains, which are not available everywhere. And it is too expensive to travel by plane frequently. The third reason is the most important one. The American spirit of independence is what really made cars popular.
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【单选题】已知a={10,2.5,'test',3+4j,True,5.3,2.5},则print(a)的输出结果是( )
A.
{10, 2.5, 'test', 3+4j, True, 5.3, 2.5}
B.
{ True, 2.5, 5.3, 10, 3+4j, 'test'}
C.
10 2.5 'test' 3+4j True 5.3 2.5
D.
True 2.5 5.3 10 3+4j 'test'
【简答题】设X～N(10，0.02 2 )，则P(9.95＜X＜10.05)=______(已知Φ(2.5)=0.9938)．
【单选题】已知: a={10, 2.5, 'test', 3+4j, True, 5.3, 2.5} , 则 print(a)输出结果 是( )
A.
{10, 2.5, 'test', 3+4j, True, 5.3, 2.5}
B.
{ True, 2.5, 5.3, 10, 3+4j, 'test'}
C.
10 2.5 'test' 3+4j True 5.3 2.5
D.
True 2.5 5.3 10 3+4j 'test'
【简答题】灰铸铁的性能特点是______、______、______、______、______。
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