搜索 - 科创

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业余无线电在世界范围内明明就是一个正在没落的爱好，一聚餐老头子能坐十桌，年轻人（小于40岁）只有两桌，再过十年估计还剩下一桌。中国有特殊的情况，主要是因为政策原因，这项爱好曾经发展得不好，在人口中的...

还有，你敢保证接触法制硫酸使，一点氮氧化物都没有吗？现在，沸腾炉里通入的是高压空气，空气里绝大部分是氮气，反应又至少7、800度，燃料又是矿石，里面一定含有硝酸盐，这样的高温高压下，氮气和氧气反应、硝...

引用第83楼hamdad于2009-02-15 01:15发表的我的理解： :电源是『场源』（电子源/空穴源），推动整个回路产生电流（电子流）的能量之源泉，在开关未闭合的状态，开关两端场强应该是最高...

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