Triangular Bronze Arrowhead of Qin Dynasty: Its surface received special antirust treatment and it has a neat shape.
文物：秦青铜三棱箭镞，表面经过特殊防锈处理，形制规整划一。
The failure mechanism of lead bronze shaft sleeves with many pits on their internal surface is analyzed by optical metallograph and EPMA.
利用光学金相和电子探针等分析手段，对铅青铜轴套内表面出现凹坑及碎粒造成的磨损失效进行了分析。
The product is made of high quality low-carbon steel with sintering porous bronze as its interlayer, with the compound of POM as its surface.
该产品是以优质低碳钢板为基体，中间烧结一层多孔青铜层，表面轧制一层POM混合物。
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