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单选题
动力装置或通过排气或转动螺旋桨产生推力。
A
The power plant uses an air vent or propeller to produce power.
B
The power plant develops thrust either through the exhaust or through a propeller.
C
The power plant generates propulsion with the aid of the exhaust or a propeller.
答案解析
正确答案：B
相关知识点：
动力装置推力产生要记清
