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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

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

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

back-geared ==> 后齿轮的 | back-geared upright drill press ==> 背齿轮立式钻床 | back-hand drainage ==> 倒转水系

back tube plate：后管板

[后]退焊接 back step welding | 后管板 back tube plate | 备用断路器 back-up breaker

back tool rest：后刀架

back to face ==> 反面对反面相叠 | back tool rest ==> 后刀架 | back trace technique ==> 向后追踪技术,回溯技术

tool back plane：切深剖面

tool back clearance ==> 刀具纵向后角 | tool back plane ==> 切深剖面 | tool back rake ==> 刀具纵向前角

back taper tap：倒锥丝锥,机用丝锥

back taper ==> 倒锥 | back taper tap ==> 倒锥丝锥,机用丝锥 | back tax ==> 退缴税

Back swing：上杆, 后挥杆

Back spin 下旋球(後旋球) | Back Swing 上杆, 后挥杆 | Back Tee 发球区(职业男选手比赛时), 后方球座

hooter：汽笛

hootenanny 乡间音乐 | hooter 汽笛 | hoots 咄

abridged edition：节略版

节点的 nodal | 节略版 abridged edition | 节目码流 program stream