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取两根留有铜帽的五号或二号电池的碳棒由铜帽上分别焊上引线,另取一根直径7—10cm长度10cm左右的玻管,在酒精灯上加热
Take two carbon rods with No. 5 or No. 2 batteries with copper caps. Solder the leads from the copper caps respectively. Take another glass tube with a diameter of 7-10 cm and a length of about 10 cm to heat the alcohol lamp.