一个正方形平顶天花板上每边装20盏灯,一共需要请选择ABCD7t9|9|-Z'K/c8w2o:g7h盏灯。2D0\*J/g(F*t1L(g
A、402D0\*J/g(F*t1L(g
B、762D0\*J/g(F*t1L(g
C、442D0\*J/g(F*t1L(g
D、422D0\*J/g(F*t1L(g