... main seal ring 主要的密封环 main ring system 环形管路系统 main plate enlargement ring 主夹板衬框 ...
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ring main cargo line system 环形货油总管系统
ring main system 环形总水管系统 ; 循环供油管道
pressurized ring main system 环形压力母管
·2,447,543篇论文数据，部分数据来源于NoteExpress
But the shut-down schedule also includes upgrades to all four of the LHC's detectors, the shielding of electronics, and even an overhaul of the ventilation system of the tunnel that houses the main accelerator ring.
BBC: LHC switches off for two-year break
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