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| bell and hopper (Bell and hopper is a charging apparatus at the top of a blast furnace and so devised that the raw materials can be fed into the furnace while the escape of gas is prevented. 料钟和料斗是一种高炉炉顶装料设施，如此设计可将炉料装人炉中，而又能避免炉顶煤气逸出。) | |||
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