6个数字复式三中三有多少组

简介：The environment in the classroom is still dim. Only the incandescent lamps in the front row are turned on, and the surrounding rows of incandescent lamps are extinguished. As a result, the classroom seems to be forever wandering in darkness. Although Yang Xiaomin, the senior classmate, said not to save money on electric lights, But the league secretary in the class, who is very economical, is always reluctant to bear the electricity bill.