This low-level area of the hardware allows you to reset a hung system, boot from a specific device (like a CD or a network boot), or get into single-user mode.
硬件的这个低级区域允许您从特定的设备（如 CD 或网络）启动重新设置挂起的系统，或允许您进入单用户模式。
Software above the level of a single device.
软件可超越单一设备的级别。
The technical condition evaluation model for single device was established and the technical condition level was obtained by the simple and feasible integrated graded evaluation method.
其次，建立单设备的技术状态评价模型，通过简单而可行的分级综合评估方法得到单设备的技术状态等级；
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