一个关系模式的定义格式为______。
参考答案:关系名(属性名1,属性名2,…,属性名n)
Professor Smith, along with his assistants, on the project day and night to meet the deadline
(截止日期). [ ]
A. work
B. working
C. is working
D. were keeping
在评价国际投资环境时,投资者一般考虑的因素包括()
A.获利性
B.安全性
C.利润可汇性
D.合作期限
E.货币稳定性