飞机喷气发动机进气口管，直径6.00英寸。
Aircraft jet engines air inlet ducts, up to 6.00 inch diameter.
和T分别是发动机进气口处的大气压力和环境温度。
Where and t are the barometric pressure at the engine's air intake and ambient temperature respectively.
早期的喷气式发动机进气口狭窄且噪音巨大但是随着前部风扇直径的增大发动机变得越来越安静。
Early jet engines had narrow inlets and were very noisy, but as the diameter of the fans at the front increased, the engines became quieter.
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