A. 与压门栓同步,对取门机前后进油缸进行瞬间泄压,确保提升炉门时炉门刀边脱离炉框镜面 B. 实现上下压门栓油缸能同步进行动作,确保炉门上下受力平衡 C. 提升炉门之前轻微晃动炉门,减小炉门刀边与炉框镜面的粘着力,确保炉门提升动作完成
A. the distance between them remains the same B. the distance between them is changing C. the position between them is not changing D. their positions to the earth remain the same
A. 正确 B. 错误