请回答下列问题1 实验开始前先打开a部分的活塞k1持续通入一段时间的氮气再关闭k1其目的是 装置中b瓶的作用是 2停止反应后 Template




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tomski请回答下列问题1 实验开始前先打开a部分的活塞k1持续通入一段时间的氮气再关闭k1其目的是 装置中b瓶的作用是 coloring