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将1.5克CaCO_3粉末,1.5克Sn粉混和均匀加入一支大试管底部,把试管平放,塞一些石棉绒再小心地在试管中部再加入1克左右
Mix 1.5 g of CaCO 3 powder and 1.5 g of Sn powder into a large test tube. Place the test tube flat, stuff some asbestos and carefully add another 1 g to the middle of the tube.