The utility model relates to a bipolar electrocoagulator which belongs to a medical apparatus. A double tube push-pull principal oscillation circuit is composed of a transistor.
本实用新型涉及双极电凝器，属于医疗仪器，由晶体管构成双管推挽主振电路。
2
Research progress in PEMFC including catalyze, electrode, proton exchange membrane, electrolyte, bipolar board and carbon nano-tube were described.