阅读理解
   The best thing about going to school is learning how to read. Books are great friends. They can help you to learn about anything you want to know. They can go anywhere with you. You can read about animals, faraway places, people, and anything else.
   Books are written by people called authors(作者). Authors think of things they want to write about. They make a plan for a book and start to write .Some authors write books that give us information(信息)and teach us things. Authors are very important people because they help us learn. Find a good book to read and read every day ,You will enjoy your time with a good book.

已知$m,n$是两条不同直线，$\alpha ,\beta ,\gamma$是三个不同平面，下列命题中正确的是(   ）

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（Ⅰ）当 $\left|CD\right|=\frac{3\sqrt{2}}{2}$ 时，求直线l的方程；

（Ⅱ）当点P异于A，B两点时，求证： $\overrightarrow{OP}\cdot \overrightarrow{OQ}$ 为定值．