下图是我国部分地区略图,据图及结合所学知识回答下列问题。
(1)京九铁路位于                 铁路和                铁路两大铁路干线之间。该线与长江的交点是                
    (城市),此城市附近有湖                (名称)。该线与陇海铁路线交点是                  (城市),该
    城市位于                 省(名称)。
(2)京九铁路建设的主要区位因素有:
    ①                                                                                                                                
    ②                                                                                                                                 
    ③                                                                                                                                 
    ④                                                                                                             
(3)图中A和B两地分别建有我国两个大型钢铁企业,影响两地该工业布局的最主要区位因素分别为:
    A____________________________                                                                                                     
    B___________________________                                                                                                       
(4)C城市兴起的最主要区位因素是_______________                                                                          

(5)图中甲、乙两个阴影所在地区商业网点的显著差异是:
    甲                                                                                                                                                     
    乙                                                                                                                                                     
    原因是 __________________________________________________