单选题：具有多媒体功能的微型计算机系统，常用CDROM作为外存储器，它是（　　）。

题目内容：

具有多媒体功能的微型计算机系统，常用CDROM作为外存储器，它是（　　）。 A．只读存储器
B．只读光盘
C．只读硬盘
D．只读大容量软盘

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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