单双岸型公式推导过程

简介：This social class meeting is not very rigorous. It is mainly for fun and for the students to relax. So at the beginning, Liu Lei and others took soda and disposable cups to pour soda to the second class, or distributed melon seeds, biscuits, spicy sticks and other snacks. , in Liu Lei’s words, this is called taking the lead, acting like a landlord first and suppressing the second squad in terms of momentum.