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Normal operations The nose of insulator appears yellow-brown, brown or lightish gery, electrode erosion is light. It shows the spark plug is suitable for the engine. 正常狀況火花塞絕緣體裙端呈黃褐色,褐色或淺灰白色,電極燒蝕很小,表明該火花塞與發(fā)動機是匹配的。