发布时间:2025-01-17 21:45:38
老式缝纫机皮带分为两种。一种是纯牛皮挤压制造。一种是橡胶织物皮带。 牛皮的经久耐用价格不高。这两种皮带一般在小百货经营部,或者缝纫设备经营商店有售。多说 五元一根。送皮带勾
高压双电源或者双回路供电时两路电源是同时运行还是一路运行另一路备用
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