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【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
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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
【单选题】Neodumetia sangawani ate
A.
A forage grass
B.
B rice fields
C.
C coconut trees
D.
D fruit trees
E.
E water hyacinth
F.
F parthenium weed
G.
G Brazilian beetles
H.
H grass-scale insects
I.
I larval parasites
【单选题】Disapene scale insects feed on
A.
Aforage grass
B.
Brice fields
C.
C coconut trees
D.
D fruit trees
E.
E water hyacinth
F.
F parthenium weed
G.
G Brazilian beetles
H.
H grass-scale insects
I.
I larval parasites
【单选题】Leaf-mining hispides blighted
A.
A forage grass
B.
B rice fields
C.
C coconut trees
D.
D fruit trees
E.
E water hyacinth
F.
F parthenium weed
G.
G Brazilian beetles
H.
H grass-scale insects
I.
I larval parasites
【单选题】An Argentinian weevil may be successful in wiping out
A.
A forage grass
B.
B rice fields
C.
C coconut trees
D.
D fruit trees
E.
E water hyacinth
F.
F parthenium weed
G.
G Brazilian beetles
H.
H grass-scale insects
I.
I larval parasites