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单灯就是光源,配光镜的灯。标有D的单灯,这个D是ECE R7法规里的关于认证标志字母:On devices which may be used as part of an assembly of two lamps, the additional letter "D" to the right of the symbol mentioned in paragraphs 4.2.2.1 and 4.2.2.4. 标有“D”的单灯就是指可以和前位灯,后位灯或刹车灯组合使用的灯。