如果在C盘当前文件下已存在名称为studata.dat的顺序文件,那么执行语句Open "C:\studata.dat" For
A. 删除文件中原有内容
B. 保留文件中原有内容,并在文件尾填加新内容
C. 保留文件中原有内容,并在文件头填加新内容
D. 以上均不对
查看答案
户外高压隔离开关常用的有()和GW5等系列。
A. GW4
B. GN19
C. GN24
D. GN30
切向键常用于()机械设备中。
A. 小型
B. 大型
C. 重型
D. 轻型
Their resourcefulness and ingenuity have spawned new industries and contributed a great many innovative ideas and technological breakthroughs. Here " spawned" means "______."
A. took part
B. spelled
C. sprained
D. produced
In the author's opinion, what is the hast product of civilization?
A. Work to some extent.
Be free from hard work.
C. Make wise use of leisure.
D. Keep oneself busy with trifles.