发生细粉分离器堵塞时，应立即关小排粉机入口挡板，停止给煤机和磨煤机，检查锁气器或木屑分离器，疏通下粉管，正常后重新启动磨煤机和给煤机运行。
参考答案：对
外部环境对系统加以约束或影响，称为反馈。
During the Spring Festival, the heavy snow stopped many people from _____ back home.[ ]
A. go
B. goes
C. went
D. going
