小学自然教师在教学中能否保证实验的成功,在这很大程度上取决于教师预做实验的情况。下面是我在教学中的几点体会。 1.有利于实验材料的选择 教学《卵石是怎样形成的》之前,我预做了风化作用对岩石破坏的实验。我找来几块页岩,放进炉子里烧热后再浸在冷水中,发现有的石块明显炸裂,有的炸裂现象不明显。经反复实验、分析,终于找到了原因。原来炸 Whether elementary teachers can guarantee the success of experiments in the teaching of primary schools depends largely on the preconditions made by teachers. Here are some of my experiences in teaching. 1. Is conducive to the choice of experimental materials Teaching “Pebble is formed,” I pre-made the weathering of rock destruction experiment. I found a few shales, put them into the stove and then immersed in cold water, and found some obvious burst of rocks, and some burst phenomenon is not obvious. After repeated experiments, analysis, finally found the reason. The original fried