It is of polyurethane foam inside , in order to increase the intensity of crossarm and the prevention of rainwater infiltration;
管内有聚氨酯发泡剂，以增加横担的强度和防止雨水渗透；
It is of polyurethane foam inside , in order to increase the intensity of crossarm and the prevention of rainwater infiltration;
管内有聚氨酯发泡剂，以增加横担的强度和防止雨水渗透；
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