题目内容：
把内存中的数据保存到硬盘上的操作称为（ ）。
A．显示 B．写盘
C．输入
D．读盘
参考答案：
单选题：把内存中的数据保存到硬盘上的操作称为（ ）。
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B．写盘
C．输入
D．读盘
B．写盘
C．输入
D．读盘
CD—ROM是（ ）。
CD—ROM是（ ）。A．大容量可读可写外存储器 B．大容量只读外部存储器 C．可直接与CPU交换数据的存储器 D．只读内部存储器
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