... engine system operational procedure；发动机系统操纵步骤 engine systems operation；发动机系统工作 engine systems status；发动机系统状态 ...
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diesel truck engine systems operation 货车用柴油发动机系统的工作
A small turbine engine in the airplane for supplying electrical and pneumatic power for systems operation on the ground or in flight.
辅助动力装置是飞机内的小涡轮发动机，在地面或空中给各系统提供电源和气源。
Solid propellant engine systems are basically less flexible in operation than liquid or hybrid propellant systems.
固体推进剂发动机系统的可调性基本上比液体或混合型的要差。
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