题目内容
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 ____.
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According to the ratio between composite materials and structural weight, which of the following used most composite materials? ____.
The safety coefficient of the capacity of composite materials is usually ____ times of metal materials.
The longest composite panels in the world come from ____ aircraft.
During the development and application of the composite materials, we should put ____ as the top priority.
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