单项选择题
A.2.5m,5.0m B.3.0m,5.5m C.2.5m,5.5m D.4.0m,7.0m
A.4m,6m B.4.5m,6m C.4m,9m D.4.5m,9m
A.10min B.20min C.30min D.45min
A.0.5m,1m B.0.5m,2m C.1m,0.5m D.1m,2m
A.一 B.二 C.三 D.四
A.L>3000m,F>100m2 B.1000m<L≤3000m,50m2<F<100m2 C.500m<L≤1000m,30mm2<F<50m2 D.L≤500m,F<30mm2
A.20 B.25 C.30 D.35
A.3 B.5 C.8 D.10
A.集中控制型 B.分散控制型 C.蓄光型 D.电光源型
A.1 B.2 C.3 D.4