硼、碳、氮、以上元素有那些用途请用途两个或以上
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![硼、碳、氮、以上元素有那些用途请用途两个或以上](/uploads/image/z/12367701-45-1.jpg?t=%E7%A1%BC%E3%80%81%E7%A2%B3%E3%80%81%E6%B0%AE%E3%80%81%E4%BB%A5%E4%B8%8A%E5%85%83%E7%B4%A0%E6%9C%89%E9%82%A3%E4%BA%9B%E7%94%A8%E9%80%94%E8%AF%B7%E7%94%A8%E9%80%94%E4%B8%A4%E4%B8%AA%E6%88%96%E4%BB%A5%E4%B8%8A)
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