A.8~10L/min B.4~6L/min C.6~8L/min D.5~7L/min E.7~9L/min
A.3天 B.5天 C.2周 D.1周 E.4周
A.10mg/m3 B.20mg/m3 C.30mg/m3 D.40mg/m3 E.50mg/m3