Thrust of jet fan is determined under calculating the total thrust in vehicular tunnel.
在计算隧道中总推力的前提下确定出射流风机的推力.
Even among fan-jet engines, noise levels have been considerably reduced with the most recent models compared to the earliest types.
即使在扇喷气发动机,噪音水平已大大减少,与最新型号比最初型。
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