Electric-welded tubes for cardan shafts 传动轴用电焊钢管
electric vacuum ceramic tubes 电真空陶瓷管
electric radiant tubes 电热辐射管
induction tubes of electric 感应起动器
So, the electric tubes were predicted to extinct.
所以， 电子管被认为将绝迹。
The use of DC electricity is another source of static electric fields, e.g. rail systems using DC, and televisions and computer screens with cathode ray tubes.
使用直流电是产生静电磁场的另一个原因，例如铁路系统使用直流电，电视和计算机屏幕带有阴极放射管。
Electric air heaters emersion heaters, heater tubes after burners, flange heaters.
电子空气加热器，复现加热器，燃烧，加热管，滚边加热器。
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