[填空题] 行动研究的特征概括为三点就是（）、（）、（）。

Refer to the exhibit:The technician wants to upload a new IOS in the router while keeping the existing IOS. What is the maximum size of an IOS file that could be loaded if the original IOS is also kept in flash?（） ["3MB","4MB","5MB","7MB","8MB"] 叉车对于提高（）、降低劳动强度发挥了很大作用。 ["物资分流","运输效率","装卸效率","货物管理"] 攻击性行为 设异步传输时的波特率为4800bps，若每个字符对应一位起始位，七位有效数据位，一位偶校验位，一位停止位，则每秒钟传输的最大字符数是（） ["4800","2400","480","240"] 有效应力。 行动研究的特征概括为三点就是（）、（）、（）。