问题
单项选择题
数据库应用系统中的基本逻辑工作单位是( )。
A.一个查询
B.一个过程
C.一个事务
D.一个程序
答案
参考答案:C
解析:事务是用户定义的一个数据库操作序列,这些操作要么全做,要么全不做,是一个不可分割的工作单位。
数据库应用系统中的基本逻辑工作单位是( )。
A.一个查询
B.一个过程
C.一个事务
D.一个程序
参考答案:C
解析:事务是用户定义的一个数据库操作序列,这些操作要么全做,要么全不做,是一个不可分割的工作单位。
第五部分:词汇 1.选择合适的单词或短语填空:(注意用正确的形式)(共10小题)
2. These developments have created a great _____________ for home computers. 3.. You can join the class if you parents__________. 4. The collector has__________ a fine collection of impressionist paintings. 5. Before you leave the office, everything should be put _____________. .6. He gave us very _____________instructions. 7. In this way they can better ____________theory ____________ practice. 8. The sea air has ____________ her health. 9. He _________________ the audience with his performance. 10. As they had no children of their own, they _______________an orphan.(孤儿) |