①性激素②突触后膜上的受体③淀粉④唾液淀粉酶⑤纤维素⑥胰岛素

Dear friend,
    I am a girl from Beijing. I am a quiet girl. I like reading books. I want to be your friend. Now let me introduce my family to you. I have a good family. My father is tall and thin. He is a math teacher. My mother is a nurse. She likes reading books. My brother is a university student. I love my family very much. Welcome to my home.
                                                                                                                                                                                             Yours,
                                                                                                                                                                                               Li Xin

香港电子地图是GIS（地理信息系统）的典型反映，与普通地图相比，具有很多优点。据此回答：

GIS技术与普通地图的共同特点是（   ）

人用绳子通过动滑轮拉物体A，A穿在光滑的竖直杆上，当以速度v₀匀速地拉绳，使物体 A到达如图所示位置时，绳与竖直杆的夹角为θ，以下说法正确的是（   ）