NBN-HD 021 5-1993 0000 Polyvinyl chloride insulated cables of rated voltages up to and including 450 750 V Part 5 Flexible cables (cords)《导体和以聚氯乙烯绝缘的电缆，从指定电压到更接近于450 750伏 第5部分：易弯曲的.pdf

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