题目

King Midas used to love gold. One day he met a fairy who allowed him to make a wish for something. The king replied at once , ‘‘I love gold . I want everything I touch to change into gold”. ‘‘Very well , tomorrow morning, everything you touch will turn into gold .”Saying this, the fairy disappeared.     The king waited excitedly till the next morning. To his joy ,everything he touched changed immediately into gold. ‘‘I’m the richest man in the world now.” He shouted.     Soon Midas became hungry. He sat down at his table. All the foods and drinks turned into gold in h 现有两个小灯泡，上面分别标有“6 V，1.2 W”和“12 V，6 W”字样，如果把这两个灯泡串联起来，为了使其中一个灯泡持续正常发光，那么加在串联电路两端的电压是多少伏？