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一、盛NO_2的U形密封管的制作: 用一支干净、干燥的U形管在酒精喷灯(或煤油喷灯)上强热,先将U形管一端,距管口三
First, the production of U-shaped sealed NO_2 pipe: Use a clean, dry U-shaped tube on the alcohol torch (or kerosene burner) on the heat, first U-tube end, from the nozzle three