搜索 - 科创

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呵呵，想法很不错，但是PPR耐压耐温性能都比PVC更出色，用此方法处理PPR不是能获得更强的的性能么？！！虽然PPR耐压已够，关键在于堵头和喷管的性能瓶颈…

氢要燃烧还得带氧，每千克氢得配8千克的氧，还得配上一大堆的储存和泵送系统，降低了有效载荷。个人认为，在推力足够的情况下，加氧燃烧有些得不偿失。

长征1-C？是发射东方红一号卫星的那个型号，还是准备换用意大利上面级的型号？拆解度不是很高，不怕有恐怖分子倾向的有关人员研究，获得机密数据？

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