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（山东省淄博市2010届高三上学期期末考试） B HAVANA (Reuters) - U.S., Cuban and Mexican scientists have drawn up plans for joint research in the Gulf of Mexico, in another sign of improvement in long-unfriendly U.S.-Cuba relations. In a meeting in Havana this week, they agreed on collecting information about the Gulf, a body of water shared by the three countries but about which little cooperative research has been done in recent years. “This is a logical, low-risk area in which to begin discussions with Cuba. It is without question in our common interest to share science 把“12V　8W”和“6V　2W”的灯泡串联在12伏的电路中，比较两个灯泡的亮暗程度．