Targeting at data acquisition characteristics of vibration signals of rotating machinery, a new rotor orbit purification method using mathematical morphology filters is proposed.

针对旋转机械振动信号数据采集的特点，提出了用数学形态滤波器实现轴心轨迹提纯的新方法。

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So air purification system should be installed to ventilate the air on ship for crews' health and machinery.

为使船上的通风空气新鲜洁净，以利船员身体和机械工作，宜设置空气净化系统。

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So air purification system should be installed to ventilate the air on ship for crews' health and machinery.

为使船上的通风空气新鲜洁净，以利船员身体和机械工作，宜设置空气净化系统。

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