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> 钻头取芯的标准尺寸
radios (water-stable drill core diameter)
20160405 买磁力钻，空心钻头，钢轨钻头，取芯钻头，进口磁力钻，磁座钻找磁力钻王取芯钻头又叫空心钻头，磁力钻钻头，磁座钻钻...
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