填空。.w.@+|*H+P)v1A6_:L,o/n1M9h:@,T2\1B
用'?0I6_3?4b'g;~:M根小棒可以摆一个正方形。.w.@+|*H+P)v1A6_:L,o/n1M9h:@,T2\1B