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小学科学“宇宙”单元的教学中,有些模拟实验在操作中往往会遇到一些困难。笔者对其中两个实验进行了改进,以提高模拟实验的效率。
In the teaching of elementary science “cosmic ” units, some simulation experiments often encounter some difficulties in their operation. The author of these two experiments were improved in order to improve the efficiency of simulation experiments.