The bottom of the electric casting tank is provided with an exhaust pipe which is besprinkled with tiny holes, and oil-free compressed air are put in the exhaust pipe to play stirring action.
在电铸槽底部设一布满微孔的排气管，并通入无油压缩空气起搅拌作用；
Only no oil to produce an air compressor oil free compressed air.
只有无油空气压缩机才能产生无油的压缩空气。
When air padding is allowed and appropriate, it is imperative that clean, oil-free, cooled, dry compressed air be introduced into the vapor space.
当空气填料被允许而且是适当的时候，所引入的空气必须是洁净的、无油的、冷却的、干燥的压缩空气。
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