A.油路充氣阻塞B.油粘度太大C.高位槽油位低了一點(diǎn)D.油泵揚(yáng)程太低
A.2%B.5%C.10%D.15%
A.0.5~1.0B.1.2~1.6C.1.6~2.3D.2.0~2.5