The space charge field has the essence distinction in the vacuum and the electricchannel with plasma-background.
研究发现电子通道填充背景等离子体，其空间电荷场与真空中的有本质差别。
2
Fin electric heating tube heater: large thermal inertia, stable heating power, not blocking the air flow channel, wide heating range, long service life.
翅片电热管加热器：热惰性大、加热功率稳定、不堵塞空气流通通道、加温范围宽、使用寿命长。
3
Electronic commerce (electric business channel) is a timeliness is very strong discipline.