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Bucket-heel excavators are continuous cutting machines for soft to semi-hard materials like clay, sand, gravel, marl and their blending as well as lignite and hard coal
construct., tech. 斗轮挖掘机是连续切割机器,能切割质地柔软及半硬的材料,如黏土、沙子、砾石、泥灰及它们的混合物,还有褐煤、硬煤等