数据库的全部记录按照记录号的大小排列而成的文献集合,称为()。
A.倒排文档
B.文档
C.顺排文档
D.字段
参考答案:C
句型转换(每空一词)。
1. My father often goes fishing in summer.(对画线部分提问)
your father often do in summer?
2. She often helps her mother with the housework on weekends. (改为同义句)
She often helps her mother the housework on weekends.
3. Children usually play soccer after school.(对画线部分提问)
do children play soccer after school?
4. I think watching TV too much is bad for our eyes.(改为同义句)
I think watching TV too much is _for our eyes.
5. There's some milk in the glass. (改为一般疑问句)
there milk in the glass?
哪项技术是我国印刷术的最早形式()?
A、雕版印刷
B、结绳记事
C、拓石
D、活字印刷