A.25 B.40 C.50 D.60
A.提高 B.不变 C.减少 D.与风机并联无关
A.0.1~0.2 B.0.2~0.3 C.0.3~0.4 D.0.4~0.5
A.126.20 B.126.21 C.126.22 D.126.00
A、0.10mm B、0.3mm C、1mm
A.400~500 B.500~600 C.600~700 D.700~800
A.0.5%~0.6% B.0.6%~0.8% C.0.85%~1.05% D.1%~2%
A.350 B.400 C.450 D.500