编制的工艺文件应该真正起到指导和组织生产的作用,必须强调工艺文件的正确性、完整性、统一性和( )。
A.权威性
B.真实性
C.经济性
D.灵活性
参考答案:A
Fill in the blanks with the right forms of the given words. 用所给单词的适当形式填空。
1. I want (buy) a gift for my family.
2. The flag (cost) one dollar.
3. "It's a good idea." says Li Ming (happy).
4. Li Ming said he (want) a ball.
5. The bus (come) soon.
6. How many (people) are there in the room ?
7. What time (do) the party begin ?
8. Do you remember (play) games yesterday ?
9. How many ____ (gift) do you need ?
10. Li Ming _____ (shop) in the store now.
基于“学生一选课一课程”数据库中的3个关系: S(S#,SNAME,SEX,AGE),SC(S#,C#,GRADE),C(C#,CNAME,TEACHER) <---> 若要求查找选修“数据库技术”这门课程的学生姓名和成绩,将使用关系
A. S和SC
B. SC和C
C. S和C
D. S,SC和C