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【单选题】
Generally speaking, while keep the performance, providing that the aircraft can be reduced by 1 Kg in structure, the total weight of the aircraft can be reduced by ____.
A.
2-3 Kg
B.
3-5 Kg
C.
4-6 Kg
D.
5-7 Kg
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【多选题】Main requirements should be considered in design of aircraft structure for the whole picture of the aircraft are: ____.
A.
Meet the flight and ground static strength requirements
B.
Meet the aircraft service life requirements
C.
Meet the requirements of aircraft structure technology
D.
Meet the requirements of aircraft maintenance and reliability
【单选题】According to the ratio between composite materials and structural weight, which of the following used most composite materials? ____.
A.
F-22
B.
A380
C.
A400M
D.
B787
【多选题】Which of the following requirements are needed for selection of structural materials of aircraft? ____.
A.
High efficiency in structure
B.
Good manufacturability
C.
Convenient to maintain
D.
High reliability as the life span
【多选题】关于常温、静载下强度理论的选用原则，说法正确的是
A.
常见应力状态下，根据材料选择强度理论
B.
特殊应力状态下，根据失效形式选择强度理论
C.
三向压缩应力状态下，铸铁构件选择第三或第四强度理论，低碳钢构件选择第一强度理论
D.
三向拉伸应力状态下，陶瓷、铝构件都选择第一强度理论
【单选题】The safety coefficient of the capacity of composite materials is usually ____ times of metal materials.
A.
0.8-0.9
B.
1.0-1.25
C.
1.15-1.2
D.
1.5-2.0
【多选题】Failure criterion of composite materials are: ____.
A.
Tsai – Hill criterion
B.
Mohr criterion
C.
Hoffman criterion
D.
Tsai – Wu criterion