搜索 - 科创

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MSO大比拼(产品篇）混合信号示波器是多功能仪器的一个典型代表，也是非常成功的一个案例，这种仪器很好的切合了市场的需求。自从10多年前Agilent的前身HP做过尝试以后，业界便逐渐认识到这种仪器的...

化学试剂参考价目表这是网友（Johnny-Wei）以前上传的，现在为了方便查询，重新发在这里。10000 无水乙酸钠 CP 500g China 14.16 10001 无水乙酸钠 GR 250g E...

我不想很简单的下结论，不过我思考了几个方面，希望LZ能看一下。第一，没有电阻不知道楼主是什么意思，不过我看了一下，真空是没有电阻的，不过还是需要足够的电压。假设有足够的电压，意味着当从负极发射电子的时...

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