... steel-troweled concrete 钢镘抹面混凝土 steel-tube seat 钢管座 steel-welding fittings 钢焊接管件 ...
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steel tube Seat 钢管座
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Frame Materials: 5 foot by 1 foot 3/4" plywood shelf cut in half. steel box tubing welded to head tube, another steel box tube welded to a BB shell and to a seat tube."
框架材料： 5英尺1英尺3 / 4 “胶合板大陆架减少了一半。油管钢箱梁焊接头管，另一管钢箱梁焊接的体壳的所在地管。
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