A.1.5~1.8m B.1.4~1.8m C.1.5~2m D.1.4~1.6m
A.2mm B.3mm C.4mm D.5mm
A.熱水管應在冷水管左側 B.熱水管應在冷水管右側 C.熱水管應在冷水管上側 D.熱水管應在冷水管下側