poly-silicon back-seal 多晶硅背封
back-blade seal 背叶片密封
face seal seal joint 端面密封密封连接
angles back to back 背对背角钢
Back filling at abutment back of Bridge or culvert 桥涵台背回填
back reaming and back transportation 反扩反输
back to back 背至背; 背靠背; 背对背
back to back arrangement 背对背配置
Back to Back Bus 背板总线
Back to back charter 转租合同
back to back connection 背向接线; 背对背连接
Back to Back Converter Station 背靠背换流站
back to back diodes 背对背二极管
Back to back FX agreement 背靠背外汇协议
back to back houses 背对背房屋
Back to back ionization chamber 背对背电离室
Back to Back LC 背对背信用证
Back to back loan 背对背贷款
back to back repeater 背对背转发器