A.12%~18%B.18%~24%C.24%~30%D.30%~35%
A.1~2m3∕dB.2~3m3∕dC.3~4m3∕dD.4~4.5m3∕d
A.3~4m3∕dB.4~5m3∕dC.5~6m3∕dD.6~7m3∕d