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一、器材准备 1.玻璃试验管——管长18厘米,口径2.4厘米,容量70毫升。 2.白色搪瓷漏斗-——漏斗口径11.5厘米,容量200毫升左右,漏斗下面管部接一条8厘米长的橡皮管,在皮管下部夹一只皮管夹子(图1).
First, equipment preparation 1. Glass test tube - tube length 18 cm, diameter 2.4 cm, capacity 70 ml. 2. White enamel funnel --- funnel diameter of 11.5 cm, a capacity of about 200 ml, funnel below the tube to pick a 8 cm long rubber tube, clip in the bottom of the skin of a tube clip (Figure 1).