题目内容
The core component of television homing guidance is ____.
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Which of the China’s spacecraft has the longest flight distance by now? ____.
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 ____.
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.
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