搜索 - 科创

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哪怕喷管是个开了孔的圆柱都行，对文章中类似尺寸的发动机实测表明，当二者最小直径相同时，直孔喷管的最大推力大约是特型喷管的70%，比冲也在这个水平附近，所以没有加工条件的新手可以放心地用直喷

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