GB 1444-1987.Edison screw lampholders speci ally used for explosion - proof luminaires. 2技术要求 2.1 灯座...
GB国家标准
GB国家标准
GB国家标准
GB 1444-2008 防爆灯具专用螺口式灯座
GB 1444-2008.Edison screw lampholders specially used for explosion- proof liminaires. 1范围 GB 1444规定了...