搜索 - 科创

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做荧光棒。。。。他说什么需要0.00005mol/ml 的CPPO。。。那摩尔和克之间怎么换算？？CPPO化学式是C26H21O8Cl6各位帮我补补摩尔换算。。。

请问有谁知道在制作降落伞时怎么知道它可以承重多少啊？能计算出来吗？还是凭经验依着越大越好的原则？谢谢

一块磁铁穿过N扎直径为D的线圈，所产生的磁通怎么算（或者说产生别的东西，可以转化成磁通），谁知道公式。[s:258]

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