由于上下文的恢复是一个过程，因此在中断之后其需要一些时间来重返回到最高速度上。
Since context recovery is a process, it takes some time to get back to maximum speed after an interrupt
考试过程异常中断时，可安全准确恢复考试过程；
When the exam process broken by some abnormal events the exam system can resume safely.
断点恢复功能，加工过程中断电保护。
Function of breakpoint reset, and power failure protection during processing.
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