Which graduate tutor is the best in Ningbo University Law School? Zhang Bingsheng, Liu Manda, Sun Jianjiang, which one is better among these three? Mainly civil and commercial law

Zhang Bingsheng! The dean is very good, especially to his graduate students. He even invites them on trips and meals. He is easy to get along with and has a lot of jokes. He is very good. He is also very serious when he is serious. His classmates affectionately call him Big Pie. Bing, etc., is rated as the most popular law school teacher among students every year~ has a bright future~

The other two teachers are not familiar with me and have never taught me~