Air compression ratio is in absolute pressure calculation.
空气的压缩比是在绝对压力计算的。
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。
The influence which the included angles on the contact width is not obvious under the same compression ratio, but the highest contact pressure decreases with the increase of the included angles.
压缩率相同情况下，夹角对于底部接触宽度影响不大，但最大接触应力随着夹角的增大而减小；
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