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一、密封管的制作:取一支干净、干燥的试管在酒精喷灯(或煤油喷灯)上强热,先拉成中间细颈,后用镊子拉细管(如图1)以便密封。
First, the production of sealed tube: take a clean, dry test tube in the alcohol torch (or kerosene burner) on the heat, first pulled into the middle of the neck, and then pull the tube with tweezers (Figure 1) to seal.