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1．准备实验要与实验类型相适应，忌实验准备中的盲目性、随意性不同类型的实验对所用器材、试剂的要求不同，准备实验时要区别对待。如准备演示实验要选用专为演示实验用的大型仪器，以便使全班学生都能观察到实验现象和教师操作，增强实验直观效果。而学生分组实验可选用一些
1. Prepare the experiment to adapt to the type of experiment. Avoid the blindness and randomness in the experiment preparation. Different types of experiments require different equipment and reagents to be used. Prepare the experiment to be treated differently. For demonstration experiments, large-scale instruments used for demonstration experiments should be selected so that the entire class can observe experimental phenomena and teacher operations, and enhance the intuitive effects of experiments. The student grouping experiment can use some