搜索 - 科创

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你baidu一下无重力环境下为什么不能用含粉尘的物质做任何东西就知道了．(不止是铅笔，粉笔类的东西也一样是各国严格禁止在无重力环境下使用的东西)地球上铅笔写了字没沾牢纸面的铅粉是随重力往地下跑，想象一...

下面进入具体设计目标环节首先确定有效载荷即航电系统的具体设计目标，因为火箭其他部分的设计目标要服务于运送有效载荷的任务。概述一下航电系统的功能，包括：数据测量、数据存储与控制、数据回传、开伞控...

引用 usafn6132:不知道你指的平衡具体是什么，但是自然界的平衡一般是强者捕获弱者，弱者数量减少，强者因为食物减少而减少，同时弱者因为强者数量减少而增多，形成的循环，在这种循环里如果强者得到了其...

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