Scientific development is the expansion of existing knowledge and theories into new fields and it only approaches absolute truth in the process of obtaining more knowledge and truth.
The absolute hydrogen expansion turbine cycles of air-breathing combined turbo-ramjet engines has the advantages of good performances, simple constructions and reasonable arrangement of cycles.
完全氢膨胀循环吸气式组合发动机性能优越，结构简单，循环布局合理。
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The gas permeation power would be dependent on the gas pressure gradient and the gas expansion pressure would be dependent on the gas absolute pressure.