A.先用高檔大致對(duì)正后,再用低檔慢慢地準(zhǔn)確對(duì)正
B.先用低檔大致對(duì)正后,再用高檔快速地準(zhǔn)確對(duì)正
C.先用低檔大致對(duì)正后,再用中檔慢慢地準(zhǔn)確對(duì)正
D.先用中檔大致對(duì)正后,再用高檔快速地準(zhǔn)確對(duì)正
A.閥箱、閥座孔被刺壞
B.閥箱內(nèi)進(jìn)入雜物
C.閥被卡住
D.上水管線不密封
A、吸入不良產(chǎn)生水擊
B、活塞或閥損壞
C、閥箱座孔損壞
D、連接卡箍松動(dòng)