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大飛機(jī),零件都是自己的嗎?關(guān)鍵技術(shù)難點(diǎn)在哪里? |
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點(diǎn)評
額,活塞發(fā)動機(jī)在萬米高空真的還能工作的。。二戰(zhàn)的時候就有飛到萬米高的飛機(jī),都是活塞發(fā)動機(jī)
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