搜索 - 科创

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首先搭建反应装置a.电热套，500ml的圆底烧瓶和通水冷凝管搭建成一个回流冷凝装置b.称量反应物。74g邻苯二甲酸酐(0.5mol)与15g脲(0.25mol)混合后加入圆底烧瓶c.冷凝管通入冷凝水后...

这东西民用不多，倒不是激光收发器硬件有什么问题，也不光是大气损耗的问题，主要是白天热气流会偏折光线，假设偏折角度只有1分，双方相距一公里远的时候就会偏离17.45cm，所以这种系统白天用不了。晚上等热...

以下是引用hambaby在2006-8-10 00:52:03的发言：我小学4年级的时候NO.1次尝试制造黑色火药，天平是用一根筷子、棉线、硬纸板做的，两边挂两个纸秤盘，中间提一根线，砝码是用的N枚...

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