搜索 - 科创

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发动机材料 40Cr喷口及堵头材料：45#碳素最大外径58mm内径50mm燃烧室有效长度220mm壁厚2.5mm喉口9.0mm喉长4。0mm扩张比9.7扩张半角 12°收敛圆弧R35压缩段喉部扩张段R...

火箭发动机参数直径2.0cm。最大推力1.8kg。燃料：硝糖。飞行高度：200m。火箭发动机防潮，不需防潮保护。火箭发动机试车视频发射 10元一枚，包含点火头遥控点火器参数：长9.5cm。宽...

本款望远镜系上次团购时南京朋友临时改购80900而空缺出来的。只有一台，全新。但由于错过了和大家一起快递寄出。故邮费可能会高出当时的标准。现在镜子在我家（陕西兴平）有需要的可以和我联系镜子价格不变35...

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