如图所示系统能实现“快进—I工进—II工进—快退—原位停止”的工作循环，试列出电磁铁动作顺序表。
参考答案：
There must have been someone who has instigated a rebellion because the people are so well organized.
A．incited
B．tampered
C．intruded
D．meddled
采煤机的生产能力主要取决于工作牵引速度。（）
