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El grafito en la estructura gris de hierro fundido existe en forma de copos, y el grafito en la estructura dúctil de hierro fundido existe en forma esférica.
3. Escuche la percusión de hierro gris: el sonido es bajo, la duración es muy corta. La bola de hierro: el sonido es nítido, hay un sonido residual y la duración es corta.
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