搜索 - 科创

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因具有社会和心理压力，问卷调查的结果往往不能反映真实的情况。试想老师发下一份关于吸烟的问卷，选项只有两个：我抽烟，我不抽烟。我觉得大家都会选后者。按真实情况回答，可能面临风险或道德谴责（心理压力）的行...

引用第32楼liqi168于2009-02-11 20:50发表的 :氯化钠再能材中有什么用氯化钠饱和溶液电解出HCl，溶于水得盐酸，可以做三聚三磷酸腺苷。。。

我打算用美术的卡纸+农机胶. 我那个光盘的尾翼（https://www.kechuang.org/t/24963）太重了，结果头部也要重很多，整体就更加重然后飞不起来了http://www.tudou...

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