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【多选题】
Non-chemical rocket engines are generally accelerated to emit: ____.
A.
Hydrogen
B.
Helium
C.
Argon
D.
Xenon
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【单选题】The most important part to control the thrust of the liquid rocket engine is the ____.
A.
Jet nozzle
B.
Propellant feeding system
C.
Propellant pump
D.
Flow control valve
【多选题】The propellant feeding system of liquid rocket engine includes: ____.
A.
Vacuum system
B.
Pressure-feed system
C.
Gravity transporting system
D.
Pump-feed system
【单选题】在集中力偶作用的截面处，它的内力图____
A.
剪力FS图突变、弯矩M图无变化
B.
剪力FS图突变、弯矩M图转折
C.
弯矩M图突变、剪力FS图无变化
D.
矩M图突变、剪力FS图转折
相关题目：
【单选题】The most important part to control the thrust of the liquid rocket engine is the ____.
A.
Jet nozzle
B.
Propellant feeding system
C.
Propellant pump
D.
Flow control valve
【多选题】The propellant feeding system of liquid rocket engine includes: ____.
A.
Vacuum system
B.
Pressure-feed system
C.
Gravity transporting system
D.
Pump-feed system
【单选题】在集中力偶作用的截面处，它的内力图____
A.
剪力FS图突变、弯矩M图无变化
B.
剪力FS图突变、弯矩M图转折
C.
弯矩M图突变、剪力FS图无变化
D.
矩M图突变、剪力FS图转折
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