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电焊工用的钢丝刷背部装上一块扁钢板(长45毫米,宽4毫米),如图所示,将钢板头部磨成约60度斜度,可以清铲较大
The back of the wire brush for the welder is fitted with a flat steel plate (45 mm long and 4 mm wide). As shown in the figure, the head of the steel plate is polished to a slope of about 60 degrees to clear the shovel larger