A.質(zhì)管前移 B.入戶(hù)預(yù)檢 C.約時(shí)定點(diǎn) D.輪流交售
A.20 B.16 C.12 D.8
A.規(guī)格 B.說(shuō)明書(shū) C.合格證 D.維護(hù)