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【单选题】
It took us quite a long time to get here. It was_________journey.A．a three－hour B．a three hour CA.
12. It took us quite a long time to get here. It was_________journey. A．a three-hour
B.
a three hour
C.
three hour
D.
three hours
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【单选题】设有关系R、S和T如下图所示，则元组演算表达式{t|(u)((R(u)∨S(u))∧(v)(T(v)→(w)((R(w)∨S(w))∧W[1]=u[1]∧W[2]=∨[1]∧W[3]=∨[2])∧t[1]=u[l])}的运算结果是(48)。
A.
B.
C.
【单选题】What is the website of booking tickets online?
A.
It is http://www.12306.cn/.
B.
It is http://www. chinadaily.cn/.
C.
It is http://www. baidu.cn/.
D.
It is http://www. alibaba.cn/.
【单选题】What is the main idea of the website?
A.
which types of cargo fit different boxcars
B.
the safety features of the company’s boxcars
C.
the types of boxcars a company carries
D.
ways to reduce freight costs by using boxcars
【简答题】假设正则表达式模块re已导入, 表达式 re.search(r'\w*?(?P\b\w+\b)\s+(?P=f)\w*?', 'Beautiful is is better than ugly.').group(0) 的值为()。
【单选题】What is the main idea of the website?
A.
Which types of cargo fit different boxcars
B.
The safety features of the company's boxcars
C.
The types of boxcars a company carries
D.
Ways to reduce freight costs by using boxcars
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