题目内容
（请给出正确答案）
[主观题]
One explanation for why graphite powder acts so well as a “solid lubricant” is
A、carbon atoms in graphite are covalently bonded within planar layers but have weaker secondary bonds between layers defect
B、finely-powdered carbon has many unsatisfied bonds at the particle surfaces, which act as a “sea of electrons” to cause lubrication
C、when crushed into a fine powder, graphite establishes a “polar” distribution of charge, leading to Coulombic repulsion between powder particles
D、None of above
提问人：网友wisdom_sjb
发布时间：2022-01-07
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Figure 4.2
Figure 4.2
