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一.同一节教学演示实验的方法 1.准备工作:在教这一节课的前一星期,从市场买回猪胃,最好不用水洗,切开胃,刮下粘液,或者切几小块胃壁肌肉片,然后放入广口瓶内,与适量的水馄合,并加入少量(2—3毫升)稀盐酸,经过两天以后,就可以进行实验。 2.结合教学:教师讲到胃液的作用时,结合演示实验,在上课前一天,把处理的胃液注入四个试管里(每试管5毫升),然后把煮熟的鷄蛋白切成小块(约o.5厘米),投入试管里。实验步骤如下:——第一试管:
I. The same section teaching demonstration experiments 1. Preparation: In the week before teaching this lesson, buy pig stomach from the market, it is best not to wash, cut the stomach, scrape the mucus, or cut a few small pieces Stomach muscles, and then placed in jars, with the amount of water wonton, and add a small amount (2-3 ml) of dilute hydrochloric acid, after two days, you can experiment. 2. Combining teaching: When the teacher talked about the function of gastric juice, combined with a demonstration experiment, the treated gastric juice was poured into four test tubes (5 ml each) one day before the class, and the cooked egg white was cut into small pieces About o.5 cm), into the test tube. The experimental procedure is as follows: - First tube: