用粉笔线，以抓拍的列之间楼板线来表示底板位置。
Use a chalk line to snap a line on the floor between the columns to indicate the location of the bottom plate.
该探测器线圈与PVC列装在一个铝底板的屏蔽线圈从下部结构来电磁干扰。
The detector coils are mounted with PVC columns on an aluminium baseplate that shields the coils from electromagnetic disturbances coming from the substructure.
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