搜索 - 科创

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引用第3楼虎哥于2011-12-18 00:50发表的 : 明白楼上意思了，空中安全标准第一条：看到飞机飞来时，禁止发射玩笑开完，说正事：一，有没有必要规定塑料火箭必须装角反射器？满足哪些条件的要...

本帖最后由 lvkzh05 于 2014-2-17 16:52 编辑 woaini112108 发表于 2014-2-16 18:01 你用的是单根钢丝棉还是一撮一个点火头用一丝就行，买的时候跟...

实际上不存在万有引力。如果真的存在力那么就会感到有加速度，然而跳楼的时候和没有受力一样并没有感受到任何加速度（在太空中不受任何力和受万有引力实际上是等效的，这也叫等效性原理...

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