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GB/T 10413-2002窄V带轮(有效宽度制)Grooved pulleys for narrow V-belts(system based on effective width)...2022-06-12

GB/T 10412-2002普通和窄V带轮(基准宽度制)Grooved pulleys for classical and narrow V-belts(system based on dat...2022-06-10

风机系统改进及应用2020-06-12