多音字组词。

模：mó____     mú ____

我国民族区域自治制度（）
①是我国的根本政治制度                  ②是我国的民族政策
③是我国的基本政治制度                  ④体现了我国处理民族关系的原则 

    Hi, my name is Li Tong. I'm from a big city. My parents are doctors in a hospital. I'm in Class 1. Mr Mu's class. He is a Chinese teacher. My favourite subject is history. I like reading history books in the library. On Saturday, I play basketball with my friend Su Qi. Fish is my favourite food.

Hello, I'm Su Qi. I'm from the farm near the city. My parents are farmers. I'm in Class 3. Miss Bi's class. She is a maths teacher. English is my favourite subject. I can see a lot of vegetables on the farm. So I like reading the books about vegetables. Noodles are my favourite food.

满足条件$a=4,b=3\sqrt{2},A=45°$的$△ABC$的个数是（   ）