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在现行教材中,“硝酸和铜反应”的演示实验都是暴露在空气中进行的,因NO_2有毒,影响师生的身体康康,对此,笔者将其改进如下。
In the current teaching materials, demonstration experiments of the “nitric acid and copper reaction” are all conducted in the air. Since NO2 is toxic, it affects the health of teachers and students. For this, the author improves it as follows.