复合镍电极活性材料化学镀镍及其影响研究阳极炭条，正极炭条
Research on Electroless Nickel Plating and the Influence of Compound Nickel Electrode Material ; positive carbon
这两幅炭条是用我梦寐以求的手法和技巧画的。
Those two charcoal drawings had just the same technique and mastery I was struggling to achieve .
炭条