Last year, some groups of students in their community (社区) made a survey about “How do people spend their free time? ” The following diagrams(图表) show some results of it:
    Diagram (1): Hours for people of different ages who surf the Internet in a week.

    Diagram (2): Different days people go to the library. (library attendance)

    Diagram (3): Different programs people like.

下列是同学在网上搜到的一个历史事件的关键词“列宁”、“四月提纲”、“攻打冬宫”，这个历史事件应该是

一幅地图比例尺为1：500 000，图幅面积为10000平方厘米。根据需要，现用1：1000000的比例尺绘制同一地区的地图，据此回答下列问题。