What happened when Lang Lang was eight years old?
A.The whole family moved to Beijing.
B.He and his father went to Beijing to learn piano.
C.His mother got ill.
D.His family objected to his learning in Beijing.
第2题
在文件系统阶段,操作系统管理数据的基本单位是______。
A.文件
B.记录
C.程序
D.数据项
第3题
在文件系统阶段,操作系统管理数据的基本单位是________。
A.文件
B.记录
C.程序
D.数据项
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