A.0.25~0.30cmB.0.25~0.30mmC.0.20~0.25cmD.0.20~0.25mm
A.油箱蓋損壞B.離心風機葉片損壞C.空濾器蓋脫落D.消聲器穿孔
A.出水壓力降低B.出水壓力增高C.出水壓力不變D.出水流量變大