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【简答题】
Habitat is being lost due to deforestation and construction of __by logging companies.
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刷刷题刷刷变学霸
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【判断题】圆杆扭转变形时,横截面上同一圆周线上各点切应力大小相同。
A.
正确
B.
错误
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【单选题】The engine suitable for hypersonic vehicles is ____.
A.
Turbojet
B.
Fanjet
C.
Propjet
D.
Ramjet
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【单选题】下图所示橘黄色单元体,变形后为红色,则切应变大小为
A.
0
B.
90°
C.
任意值
D.
-90°
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【判断题】材料力学是纯理论的学科。
A.
正确
B.
错误
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【多选题】For an aircraft to fly continuously and steadily in the sky, the most basic conditions should be met are: ____.
A.
Sufficient lift
B.
Sufficient power
C.
Good piloting technique
D.
Good stability and maneuverability
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【简答题】Unrestricted __is affecting the salmon supply.
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【简答题】The bears' existence is also threatened by their low rate of __
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【单选题】The expansion stroke of a piston engines is ____.
A.
Intake
B.
Compression
C.
Combustion
D.
Exhaust
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【多选题】The main characteristics of a piston engines include: ____.
A.
More efficient when flying at low speed
B.
Are direct reaction engines
C.
When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply
D.
Widely used in some small and low-speed aircraft
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【单选题】The most basic type of air jet engine is ____.
A.
Turbojet
B.
Fanjet
C.
Propjet
D.
Ramjet
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