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
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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单选题A manufacturer has instructed a technician to update the software that resides on the flash ROMchip of an integral system add-in component. Which of the following types of software needs to be updated?（）ASystem BIOSBFirmwareCOS PatchDDriver
单选题Which of the following is a software layer that interacts between the virtualized operating system and the physical hardware？（）A System Resource ManagerB Server BIOSC Guest Operating SystemD Hypervisor
单选题Which CLI command is used to upgrade a Juniper router?（）Aload packageBload override terminalCrequest system software addDrequest system software upgrade
多选题Which two commands allow you to return to a previous version of software on the device?（）Arequest system software addBrequest system software downgradeCrequest system software replaceDrequest system software rollback
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