最终，用自由空气的数量乘以空气的压缩比即可得出排水所需的压力，以确定选择哪种空压机。
Finally, with the air of freedom multiplied by the number of air compression ratio that the pressure can be drainage, to determine choose which kind of air compressor.
最终，用自由空气的数量乘以空气的压缩比即可得出排水所需的压力，以确定选择哪种空压机。
Finally, with the air of freedom multiplied by the number of air compression ratio that the pressure can be drainage, to determine choose which kind of air compressor.
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