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用100ml量筒一支作外套管,30ml试管一支作内套管(见图一),在外套管上配一个三孔塞,内套管上配一双孔塞,然后在三孔塞右边一孔安一个稍粗的短管,左边一孔插入一支30cm的滴管,作为在外套管中加浓盐酸之用,再用两根长短不同的玻璃管分别穿过中间一孔和右边的短玻璃管,并和内套管的双孔塞连接起来(如图三)。在内外双套尖嘴玻璃管和粗玻璃管外,罩一个长10至12cm内径1.5cm的通
Use a 100ml graduated cylinder for the outer casing, a 30ml test tube for the inner casing (see Figure 1), a three-hole plug on the outer casing, a double-hole plug on the inner casing, and a hole on the right side of the three-hole stopper. A slightly thicker tube is inserted. A 30-cm dropper is inserted into the left side of the hole for the purpose of adding concentrated hydrochloric acid to the outer cannula. Two different lengths of glass tube are passed through the middle hole and the right short glass, respectively. The tube is connected to the double plug of the inner sleeve (see Figure 3). Inside the outer and outer sets of needle-tipped glass tubes and thick glass tubes, cover a length of 10cm to 12cm in diameter with a length of 1.5cm