A.3/4B.2/3C.1/2D.1/3
A.開(kāi)車(chē)時(shí)注液不夠B.泵內(nèi)吸入空氣C.底閥漏液D.葉輪反轉(zhuǎn)
A.工業(yè)上水B.物料C.蒸汽冷凝氣D.空氣