已知在平面直角坐标系xOy内，点P（x，y）在曲线C： $\{\begin{array}{c}x=1+\cos \theta \\ y=\sin \theta \end{array}(\theta$ 为参数，θ∈R）上运动．以Ox为极轴建立极坐标系，直线l的极坐标方程为 $\rho \cos \left(\theta +\frac{\pi }{4}\right)=0$ ．

（Ⅰ）写出曲线C的标准方程和直线l的直角坐标方程；

（Ⅱ）若直线l与曲线C相交于A、B两点，点M在曲线C上移动，试求△ABM面积的最大值，并求此时M点的坐标．

    When do you go to school? Maybe this is a very  1  thing for you.  2  for the students in Fujian Province, it’s a really big problem. As everyone 3 , the strong Typhoon(台风) in Fujian not only destroyed(破坏)a lot of  4 there, but also made many students lose  5 family members, teachers and classmates.
    With the 6  of people from all over our country and the world, most broken schools in Fujian 7 their new term. Among them, 132 students 8 Chenmei Primary School 9 began their study. Some other 10 of this school started their new term in other places, too. All of them are happy to be back to school. 

如图，在菱形ABCD中，AB=6，∠DAB=60°，AE分别交BC、BD于点E、F，CE=2，连接CF，以下结论：①△ABF≌△CBF；②点E到AB的距离是$2\sqrt{3}$；③tan∠DCF=$\frac{3\sqrt{3}}{7}$；④△ABF的面积为$\frac{12}{5}$$\sqrt{3}$．其中一定成立的是____ （把所有正确结论的序号都填在横线上）．