工程选用石墨掺量为10%的导电混凝土，使得接地装置的工频接地电阻均不大于0。
While graphite content in electrically conductive concrete applied in a grounding engineering is 10%, the power-frequency grounding resistance of the grounding devices is less than 0.
工程选用石墨掺量为10%的导电混凝土，使得接地装置的工频接地电阻均不大于0。
While graphite content in electrically conductive concrete applied in a grounding engineering is 10%, the power-frequency grounding resistance of the grounding devices is less than 0.
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