“PZ220﹣25”和“PZ110﹣25”的两个灯泡，正常工作相同的时间，消耗的电能之比为（　　）

①意大利是一个多党制的国家

②意大利的国家结构形式是议会制民主共和制

③欧盟是政府间、区域性的国际经济组织

④欧盟的宗旨是以共同体的方式，实现各成员国的共同目标

   Mr Smith 1from London. Now he is in China. He is 2 .He teaches 3 a middle school. He works very hard. His students like 4 very much. He can 5 a little Chinese . His students often teaches him Chinese 6 Sundays. Mr Smith likes playing football . He often plays football 7 his students.
   Mr Smith8  a son. His name is Jack. He is student. He studies in a middle school. He goes to school  9 bike everyday. He gets back home at four in the afternoon. He likes 10 TV in the evening.

制成家庭电路中熔丝的常用材料是 (    )