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想知道曝气高压风机开机前检查工作都有什么的，看这里

As soon as he had spoken, the Tin Man began to chop, and in a short time the tree fell over with a crash, whereupon the Scarecrow's clothes fell out of the branches and rolled off on the ground. Dorothy picked them up and had Winkies carry them back to the castle.

电磁屏蔽设备都有什么？