A.45mg/L B.35mg/L C.25mg/L
A.供水壓力一致 B.回水壓力一致 C.供、回水溫度一致 D.供、回水溫度
A.0.3~0.5 B.0.6~0.9 C.0.8~0.9 D.0.9~1.0