单项选择题
A.全风压Pa50~2400Pa,风量225~145m3/min B.全风压Pa25~1200Pa,风量225~145m3/min C.全风压Pa35~2400Pa,风量390~250m3/min D.全风压Pa30~1500Pa,风量112~75m3/min
A.21.6/12.5A B.11.2/6.45A C.27.5/15.8A D.155/87.5A
A.1.0% B.0.75% C.1.5% D.2.0%