填一填。
1.旧书不厌百回读,__ __。
2.____ 是人类进步的阶梯。
3.____ ,要留清白在人间。
1.熟读深思子自知
2.书籍
3.粉身碎骨浑不怕
Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
A.becomes
B.became
C.has become
D.had become
目前运用的数据恢复技术主要有()
A.瞬时复制技术
B.远程磁盘镜像技术
C.数据库恢复技术
D.瞬间磁盘恢复技术