将三角形各边向外平移1个单位并适当延长，得到如图（1）所示的图形，变化前后的两个三角形相似吗？如果把三角形改为正方形、长方形呢？

我们在上网时，经常会发现许多网站都标有“请您文明上网，理性发言并遵守相关规定”类似的提醒话语，这说明 （ ）
①上网要遵守道德②上网要遵守法律③我们要文明健康上网④在网上没有自由可言

Service robot superstars shine at conference，aim to make life easier

    At the 2017 World Robot Conference, service robots were the stars．They work most closely with people．They help to do different jobs in daily life．

    Teotronice

    Teotronice is a music teacher．He looks like the famous ET, but his 53 fingers make him play the piano well．He played John Lennon's song Imagine at the conference．

    The supermarket robot

    Are you tired of shopping in the supermarket? Now，it becomes much easier with the help of the robot．You just talk to it，and then it will lead you to the things you need to buy．You can also use the robot to pay for your items．

    Bestic

    Bestic acts as a human arm to feed people with a spoon．This robot can be a good helper for kids，the elderly and those with difficulty using their hands．

（Ⅰ）求抛物线的方程；

（Ⅱ）如果点 $P$ 恰是线段 $AB$ 的中点，求直线 $AB$ 的方程．