Wood can also be used percussion hammer approach, combined with positive and reverse pump to dredge;
也可用木锤敲击的方法，结合正、反转泵，使之疏通；
Our factory is specialized in producing various specifications of the medical stethoscope and percussion hammer enterprises.
本厂是专业生产各种规格的医用听诊器和叩诊锤的企业。
The DTH percussion-compact drilling is a high efficiency technology drilling in soil strata, which use the impact force produced by hammer piston to crush and compact soil.
潜孔锤冲击挤密钻进技术集冲击钻进、振动钻进及空气钻进的优点于一体，钻进效率高，成孔质量好，在土质地层钻进工程中有着广阔的应用前景。
The DTH percussion-compact drilling is a high efficiency technology drilling in soil strata, which use the impact force produced by hammer piston to crush and compact soil.
潜孔锤冲击挤密钻进技术集冲击钻进、振动钻进及空气钻进的优点于一体，钻进效率高，成孔质量好，在土质地层钻进工程中有着广阔的应用前景。
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