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耦，回授
back current || 反向电流
back donation || 反馈
back draft || 回程
back drop || ①交流声②干扰③背景
back edge || 后沿
back electromotive force || 反电动势
back elevation || 后视图
back feedback || 反馈，回授
back flashover || 反击雷闪络，反向闪络
back flush || ①反向洗涤，回洗，逆流洗涤②反向色谱
back flushing || 反吹
back focal length || 反焦距
back focal plane || 反聚焦面
back focus || 反焦点
back ground || 背景，底影，基础
back guy || 后拉线
back induction || 去磁作用
back kick || 反向放电
back lash error || 齿隙误差
back layer || 摄影背面层
back light || ①后灯②背景光，后照光
back magnetization || 反磁化
back mission || 反向发射
back motion || 倒转，反向运动
back nut || 后螺母，限动螺母，支撑螺母
back of a knife || 刀背
back of arc || 拱背
back of film microscope || 胶片后聚焦显微镜
back off system || 主操作系统，基本操作系统
back peak || 反冲峰
back pitch || ①后(节)距，背节距②反螺旋
back play || 空程，空隙
back porch || 后沿
back pouring || 补浇
back pressure || 反压力，回压，背压
back pressure evaporator || 背压式蒸发器
back pressure test || 回压试验
back purge || 反冲
back rake angle || 纵向前角
back reflection || 背反射
back reflection X-ray examination || 背射X射线检验
back reflection photograph || 背射照相
back resistance || 逆向电阻，反向电阻
back rolling || 重复滚压
back scattered electron || 背散射电子
back scattered electron beam || 背散射电子束
back scattered electron image || 反散射电子图像
back scattered radiation || 反散射辐射
back scattering spectrometry || 反散射谱法
back scheduling || 倒排日程
back shop || 修理厂，修理车间，辅助车间
back signal || 回应信号，回原信号
back slagging || 炉底出渣，炉后出渣
back space || 退位，退格，回退
back stay || 后拉线，后撑条
back streaming || 回流
back surface field || 背面场[BSF]
back surface reflector || 背表面反射器[BSR]
back taper || 倒锥
back titration || 反滴定
back tool rest || 后刀架
back transient || 反向瞬态过程
back up equipment || 后援设备
back view || 后视图 后视景
back view mirror || 望后镜
back wall || 后壁式
back washing machine || 复洗机
back wave || 反射波，回波
back wedge angle || 纵向楔角
back welding || 封底焊
back-and-forth movement || 往返运动，往复运动
back-checking || 返回校验
back-diffusion || 反向扩散，逆扩散
back-end || ①后头，尾端②未采部分
back-end computer || 后端计算机
back-extractant || 反萃取剂
back-extraction || 反抽提，反萃取
back-filling tamper || 回填压实机
back-fire relief valve || 阻火器
back-flame boiler || 回焰锅炉
back-lash || ①轮齿隙，齿隙游移②后冲，后座③余隙，间隙④回闪
back-of-board wiring || 盘后接线
back-off || ①补偿②拧松，拆开，解开③抽出，撤离，退刀
back-off angle || 后角
back-out || ①脱出，扭松，旋出，甩出(如螺栓等)②逆序操作③退火
back-plate || 制动器底板
back-porch effect || 后沿效应
back-porch tilt || 后沿倾斜
back-pressure steam turbine || 背压式蒸汽透平
back-pressure turbine || 背压式汽轮机
back-projection cabinet || 屏幕放映机
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