NBN-EN 279-1992 0000 《采用压力达200毫巴可燃气体的家用器具动态密封用均质橡胶材料规范》.pdf

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HG T 2196-1991 机动车辆用橡胶材料.pdf

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HG 2181-1991 酸碱用O形圈橡胶材料.pdf

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