下列变化中,属于化学变化的是(     ) A.用石墨粉打开生锈的

下列变化中,属于化学变化的是(    

A.用石墨粉打开生锈的铁锁          B.金刚石加工成项链

C.石墨转化为金刚石                D.铅笔芯折断

答案

C

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