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bood back liner lining：(书本)封面衬里

bood back liner jacket 书本封面套 | bood back liner lining (书本)封面衬里 | bood back liner shavings 书籍纸切边

back link：后连杆

back light 后灯 | back link 后连杆 | back mirror 后视镜

back pitch：背节距

back piece 背材 | back pitch 背节距 | back pitch 铆钉背距

back pitch：铆钉背距

back pitch 背节距 | back pitch 铆钉背距 | back plan 底视图

back pitch：橫節距(鉚接)

"齿背","back of tooth" | "横节距(铆接)","back pitch" | "后扶架","back rest"

back pitch：后节距

反位锁 back lock | 后节距 back pitch | 后廊期 back porch period

back and front pitch of awinding：绕组的前后节距

back and forth来回 | back and front pitch of awinding绕组的前后节距 | back and stopping trial倒车及停车试验

back and front pitch of a winding：绕组的前后节距

back and forth 来回 | back and front pitch of a winding 绕组的前后节距 | back and stopping trial 倒车及停车试验

back rest：靠背架

back projection 反射影 | back rest 靠背架 | back scatter constant 反向散射常数

back rest：座椅*背

Back pressure valve 背压阀 | Back rest 座椅*背 | Back shaft 后轴

steam trap valve：疏水阀

球阀 ball valve | 疏水阀 steam trap valve | 蛇管式换热器 serpentine type heat exchanger

aldermanship：市政官

aldermanry 议员 | aldermanship 市政官 | Alderney 乳牛