backmen后卫
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
backwall photovoltaic effect后膜光电效应
back boost current regulator升降压式稳流器
backfilling with coal refuse矸石充填
backfilling pressure casting回填压注
back of bridges and culverts桥涵台背
back flush of instrument tube仪表反吹风
backtracking control strategy回潮控制策略
back opening examination cape背开式检查披肩