update lab4 process-concept-homework.md

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yuchen 2015-04-08 11:24:18 +08:00
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```
- 进程切换行为:系统决定何时(when)切换进程:进程结束或进程发出yield请求
### 进程执行
```
instruction_to_execute = self.proc_info[self.curr_proc][PROC_CODE].pop(0)
```
### 执行实例
#### 例1