搜索 - 科创

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前言：刚考完四六级，正好是偷懒不想复习，找了个冠冕堂皇的理由说不看书，找个英文的东西练一下翻译（其实就是开小差）。十月份被帽子叔叔查了水表，说我网购硝酸钾和硫，被没收了一部分化学品。虽然还有材料制作燃...

综合考虑安全性和成本，给发动机装防爆盾较为合适，重量和成本不超过发动机本身，甚至可以用在一次性的火箭上。在世界运载火箭当中只有SpaceX的F9这样做，并且做到了在一台发动机破裂、燃料大量泄漏的情况下...

引用 QQQQQQQ:高毒+1 其实毒不毒是LD50硬测出来的，不是一个质疑说质疑谁就完事的，举个例子：肼高毒碳酰肼几乎无毒尿素无毒光气剧毒下面是一些常见物质的LD50. 对比看来，偏磷酸...

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