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在点燃分级蜡烛后,将一块宽约40mm、长约200mm的玻璃板伸入烧杯内,挡住火焰,然后倾倒二氧化碳,使它沿玻璃板的斜面缓缓流
After lighting the graduated candle, place a glass plate about 40 mm wide and about 200 mm long into the beaker to block the flame, then pour the carbon dioxide so that it flows slowly along the slope of the glass plate.