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back office force：内勤人员

back off compensate ==> 补偿 | back office force ==> 内勤人员 | back order ==> 返回次序,欠交订货,延迟交货,延期交货

Back Segs：后面片段数

Back Length后面长度 | Back Segs后面片段数 | Back View背视图

back rashers：薄的腌(或熏)肉片

back pressure 反压 | back rashers 薄的腌(或熏)肉片 | back side 胴体 后部

back-reflection pinhole camera：背面反射针孔照像机

back-reflection focusing came 背面反射聚焦照像机 | back-reflection pinhole camera 背面反射针孔照像机 | back-reflection x-ray exami 背面反射

back pressure multi-effect evaporator：反压多效蒸发器

反压蒸发[法] back pressure evaporation | 反压多效蒸发器 back pressure multi-effect evaporator | 反滴定 back titration

back pressure spring valve：背压弹簧阀

back pressure relief valve 背压安全阀 | back pressure spring valve 背压弹簧阀 | back pressure test 背压试验

Back pressure valve：止回阀,背压阀

back pack pump tank fire extinguisher ||[消]小型背负泵式灭火器 | back pressure valve||止回阀,背压阀 | back scattering||反向(后向)散射

naturally ordered quasi-adequate semigroup：自然序拟适当半群

背靠背:Back-to-Back | 自然序拟适当半群:naturally ordered quasi-adequate semigroup | 回喷:Back-ejecta

back wear：背向磨损

back wave ==> 反射波,反射波 | back wear ==> 背向磨损 | back welding ==> 底焊,退焊法

back geared upright drill press：带齿轮立式钻床

back geared motor 带减速齿轮的电动机 | back geared upright drill press 带齿轮立式钻床 | back grey 印花衬布

air ventilator：通风管

air purifier 空气滤清剂 | air ventilator 通风管 | air-bleed 空气分泄器

sound motion picture, talkie：有声电影

silent cinema, silent films 无声电影 | sound motion picture, talkie 有声电影 | cinemascope, CinemaScope 西涅玛斯科普型立体声宽银幕电影,变 形镜头式宽银幕电影