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透气性是型(芯)砂的重要性能之一。我国目前测定透气性大部份采用气钟式透气性测定仪。气钟式透气性测定仪由于结构限制,只能在
Breathability is one of the important properties of type (core) sand. Most of the current measurement of breathability in our country use gas bell-type permeability tester. Gas bell-type gas detector due to structural limitations, only in