搜索 - 科创

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利用红外触发相机拍摄就可以了.　　按照工作原理的不同，红外触发相机装置分为主动式和被动式两种。　　主动式红外触发相机由分置的红外线发射器、接收器和拍照相机等部分组成。发射器会发射一束人眼视力不可见的红...

本帖最后由 slof 于 2014-2-8 10:06 编辑 baiwenglong 发表于 2014-2-8 09:48 太牛了。。这是，，20级的Marx？感觉电弧不是很粗。。什么原因？电源功...

引用第23楼huanghuai于2009-02-04 22:20发表的 :提一点建议啊~~用这种纸卷纸管，不要空手卷，最好套一根圆木棒卷，一定要卷扎实，那样捐出的纸管才结实，最后在纸管的横切面上涂上...

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