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for subject
Rail transport
containing
一级
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all forms
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in specified order only
Chinese
English
一级
水源保护区
class A water source protection zones
一级
活塞杆
first-level piston rod
一级
闭锁式搭扣
primary close-end locker
化学强化
一级
处理
chemically enhanced primary treatment
北美
一级
铁路公司
AAR Class 1
强化
一级
处理
strengthening primary treatment
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