back up ring是什么

back up ring是什么 ring up,ring back的区别是什么?词组后面是不是直接跟SB,需要加TO吗? back up中文版是什么? Could you please ring me ______as soon as he comes back?空中填up.back都行吗? Jack said that he would ask Mary to ring me _____ and then he rang _____.A.back;off B.off;offC.back;up D.up;up ring up怎么读 ring for 和ring up 一样吗 back-up back up 电气设备的 ring feed 是个什么东西啊 electrical back feed 是什么? 是ring sb.up还是ring up sb. LIFT Ring pull UP and ring me up什么意思 ring me up等于什么? i ll ring you up 英语lift ring pull up and back..这句看上去能理解,可仔细看看,我还是不太明白.ring前怎么没冠词.如lift是动词 后面怎么又有动词pull up call up,ring up有何区别 英语翻译Disc ring Seat ring是什么东东