Erosion, dilation, opening operation and closing operation are the basis of mathematical morphology.
膨胀、腐蚀、开运算、闭运算是数学形态学的基础。
For LW14 and LW15 SF6 circuit breaker, the reason of reclosing block after opening operation has been analyzed in the paper.
对部分LW14,LW15型SF 6断路器分闸操作后重合闸闭锁的原因进行了分析，提出了改造方案，并在实践中取得了良好效果。
In the range where the car door is not aligned with the landing door, the opening operation of the car door is mechanically stopped.
在轿厢门与层站门没有卡合的范围内，机械地阻止轿厢门的打开动作。
In the range where the car door is not aligned with the landing door, the opening operation of the car door is mechanically stopped.
在轿厢门与层站门没有卡合的范围内，机械地阻止轿厢门的打开动作。
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