搜索 - 科创

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TNT今天看到一棕玻璃瓶装镁粉。。。500克，38大元，一年前产，天津制造，值吗？？？24口蒸馏头，10元值吗？？？

1.碳在常温常压能与什么反应？2.镁条燃烧的时候能用什么灭火（化学的方式。是立竿见影的那种。别说加水。。）

用LM317做稳压电路图如下。。仿真的时候发现滑阻变化时，需要很长时间输出电压才会缓慢变化到需要的值。。这是为嘛？[s:233]

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