用含有铁族金属硫化物的复合石墨棒作阳极，在氢气氛围下实施电弧放电，制备出了双壁纳米碳管。
Using the composite graphite rods with the sulphide of iron group metals as anode, the double-wall carbon nanotubes have been fabricated by arc discharging under hydrogen atmosphere.
以石墨棒电极上的阳极电流作为土壤中还原性物质数量的指标。
The anodic current desity on the surface of graphite rod electrode is used as the index of the amount of reducing substances in soil .
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