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【简答题】
关系模型用表格形式结构来表示实体类型和实体之间的联系。关系在用户看来是一个 表 ,记录(元组)是其中的 ,属性是其中的
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举一反三
【判断题】Growth in computer use most clearly benefited women in high-blue collar jobs, such as craft workers, machinist and technicians.
A.
正确
B.
错误
【简答题】Blue-collar or white? A blue-collar worker is a tradesman. Lots of blue collar workers own homes, run businesses, and have families. They love working with their hands and not in offices. How many peo...
【判断题】By 1965, a majority of U.S. workers held white-collar rather than blue-collar jobs.
A.
正确
B.
错误
【多选题】Which of the followings are the top 9 Blue-collar Jobs?
A.
Construction and building inspectors
B.
Plumbers and pipefitters
C.
Structural iron and steel worrkers
D.
Electricans
E.
Police Officers
F.
Subway operators
G.
Plastics Surgeon
【判断题】By 1956, a majority of U.S. workers held blue-collar rather than white-collar jobs.
A.
正确
B.
错误
【判断题】Automation and AI are not only taking over blue-collar jobs but also white-collar once. Many jobs are disappearing.
A.
正确
B.
错误
【简答题】依照有关规定，我国把每年的9月20日定为（ ）。
相关题目：
【判断题】By 1965, a majority of U.S. workers held white-collar rather than blue-collar jobs.
A.
正确
B.
错误
【判断题】By 1956, a majority of U.S. workers held blue-collar rather than white-collar jobs.
A.
正确
B.
错误
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