... bridge gallery 过街楼 bridge joist 隔栅斜撑 bridge life line rescue gun 跨越救生绳枪 ...
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The paper expounded installation of expanded joist and maintenance in the operation of bridge, to ensure natural use of expanded joist.
该文主要阐述伸缩装置的安装和在桥梁运营中维修和养护，以保证伸缩装置正常使用和延长其耐久性。
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