DIN 40050-9-1993 道路车辆.IP防护等级.防外来物、防水和防接触.电器装备 (Road vehicles; degrees of protection (IP-code); protection against foreign objects; water and contact; electrical equipment)

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DIN 40050-9-1993 道路车辆.IP防护等级.防外来物、防水和防接触.电器装备 (Road vehicles; degrees of protection (IP-code); protection against foreign objects; water and contact; electrical equipment)