A.11.81% B.11.08% C.10.18% D.10.08%
A.2% B.3% C.12.55% D.12.49%
A.煤氣、給水、污水和雨水管 B.給水、污水、煤氣和雨水管 C.給水、雨水、污水和污水管 D.污水、雨水、給水和煤氣管