将胃痛与心痛、腹痛分开,始于()
A.汉代
B.隋唐
C.宋代以后
D.清代以后
E.明代以后
参考答案:E
数据保护手段中,拷贝方式存在哪些弊端?()
A.不支持以增量方式进行数据保护
B.数据格式发生变化,不能快速使用
C.不能有效保护已经打开的文件
D.不能有效保护注册表等系统文件
句型转换,每空一词.
1. Watch TV after school. (改为否定句)
_____ TV after school.
2. Do you have to go to bed by ten o'clock? (作肯定回答)
_____, I _____.
3. I have to clean my room. (改为一般疑问句)
_____ you _____ to clean your room?
4. I have to do my homework at home. (就画线部分提问)
_____ you _____ to do at home?
5. Can we eat in the classrooms? (作否定回答)
_____, you _____.