数据库重构是指()
A.有限地改变数据库逻辑结构
B.改变数据的存贮位置
C.重新设计数据逻辑结构
D.重新选择数据库管理系统
参考答案:A
中国人肝硬化最常见的原因是
A.胆汁淤积
B.酒精中毒
C.长期接触化学物质
D.血吸虫病
E.病毒性肝炎
句型转换,每空一词。
1. This is a picture of my family. (对画线部分提问)
_______ _______ ?
2. My backpack is on the sofa. (对画线部分提问)
_______ your _______?
3. Are those his keys? (改为单数形式)
_______ _______ his key?
4. Are his things on the bed? (作否定回答)
No, _______ _______.
5. I can take it to her. (改为一般疑问句)
_______ _______ take it to her?