backemfn.反电动势
backn.后面;背脊;靠背;后背;后卫vt.支持;后退adv.向后地adj.向后的;后面的;偏远的;过时的;积欠的
back-up water level回升水位
back-to-back test成对试验,整流子片试验
Back-door criterion后门准则
back trace of history历史回溯
back pressure circuit背压电路
back perspective view背面透视图
back-stair intrigue[法] 密谋
backscatter radiation(分)散(放)射
backscattering sensor后向散射仪
Back - to - front从后排至前排