下列关于碳单质用途的叙述,错误的是   A.金刚石用作钻探机的钻

下列关于碳单质用途的叙述,错误的是

  A.金刚石用作钻探机的钻头   B.焦炭用作燃料   C.用碳粉和铅制成铅笔芯     D.用石墨做电极

答案

C

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