A.0.2~0.3B.0.25~0.3C.0.35~0.4
A.0.4~0.5B.0.44~0.5C.0.35~0.4
A.實現(xiàn)無級調(diào)速B.速度變化連續(xù)C.實現(xiàn)有級調(diào)速