单选题系统软件（System Software）的主要功能是（）A管理、监控和维护计算机软、硬件资源B为用户提供友好的交互界面，支持用户运行应用软件C提高计算机的使用效率D以上都是
单选题
系统软件（System Software）的主要功能是（）
A
管理、监控和维护计算机软、硬件资源
B
为用户提供友好的交互界面，支持用户运行应用软件
C
提高计算机的使用效率
D
以上都是
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