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二、实验方法 用带12×100mm小试管的单孔塞塞紧25×200mm具支试管口,用橡胶管连接事先滴入红水的U形玻璃管。演示时在
Second, the experimental method Using a single hole plug with 12 × 100mm small test tube plug 25 × 200mm with a branch tube, with a rubber tube connected to the previous drop of red water U-shaped glass tube. During the demonstration