问题 填空题

直角三角形两直角边长分别为6cm,8cm,则其斜边上的高为(        )cm。

答案

4.8

材料题

材料1:“明朝派郑和七次下西洋,他们的足迹到达南洋与西洋,最远到达非洲东海岸和红海沿岸。”

材料2:嘉庆皇帝的上谕说:“天朝富有四海,岂需尔小国些微货物哉?”    

(1)两则材料分别反映了明、清两朝采取了什么不同的对外政策?  

                                                                                                                                                            

                                                                                                                                                            

(2)这两种不同政策产生了什么不同的后果?这种结果对你有什么启示?

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

单项选择题