灯丝供电采用恒压器，稳压精度高，寿命长，节能显著。E。
Electric supply of filament adopts constant voltage device, which has high voltage stabilizing accuracy, long life and distinct energy-saving efficiency.
灯丝供电采用恒压器，稳压精度高，寿命长，节能显著。E。
Electric supply of filament adopts constant voltage device, which has high voltage stabilizing accuracy, long life and distinct energy-saving efficiency.
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