绝缘粉末通过金属管导时，两者带上等值异号电荷。
When the insulated powder pass through the metalline pipe, both generate electrites of egualize in magnitude and opposite symbol.
绝缘粉末通过金属管导时，两者带上等值异号电荷。
When the insulated powder pass through the metalline pipe, both generate electrites of egualize in magnitude and opposite symbol.
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