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学习了氢气的知识后,老师安排了一个氢气的性质和制取实验。经过认真的预习和准备,九年级(2)班的同学们走进化学实验室,全班共分成了12个小组,在
After learning about the knowledge of hydrogen, the teacher arranged a hydrogen gas and made experiments. After careful preparation and preparation, the students in grade nine (2) entered the chemistry laboratory and the whole class was divided into 12 groups.