问题 单项选择题

水经多变磁场磁化后,其溶解能力增大约50%,所以可以靠注入井内水的磁化来提高溶剂的溶解能力,在这种情况下溶解速度可提高()。

A.5%-7%

B.15%-17%

C.25%-27%

D.35%-37%

答案

参考答案:C

问答题

世界现代史上,国际关系格局不断变化调整,影响着世界局势的发展。据此回答以下问题:

(1)两次世界大战后各形成了怎样的世界政治格局?  

                                                                                                                                                           

(2)当今世界政治格局呈现什么特点?  

                                                                                                                                                           

(3)20世纪90年代以来,地区冲突加剧。请你任举一例并说明冲突加剧的原因。

                                                                                                                                                           

                                                                                                                                                           

(4)你认为中国应该如何应对这种局势?

                                                                                                                                                            

                                                                                                                                                            

选择题