B----B

back bias                                 回綬偏壓
back chamfer                              背倒角
back flow                                 反流
back nut                                  并緊螺母
back plate                                后擋板
Back pressure valve                       單向活門
back profile                             （葉片）背面
back stop                                 止回釘；棘爪
back taper                                倒錐
backfit                                   磨合
backflush                                 逆流洗滌
background                                1.基本情況   2.底   3.背景
backing                                   底板；襯墊
backing plate/ring                        襯板/環(huán)
backing pump                              增壓泵
backkicking                               倒轉(zhuǎn)
backlash                                  游隙
backlog                                   V積壓   N待修件