题目内容：
计算机系统软件中最核心、最重要的是（ ）。
A．语言处理系统 B．数据库管理系统
C．操作系统
D．诊断程序
参考答案：
答案解析：
单选题：计算机系统软件中最核心、最重要的是（ ）。
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- 题目类型：单选题
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B．数据库管理系统
C．操作系统
D．诊断程序
B．数据库管理系统
C．操作系统
D．诊断程序
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