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II级压力容器
nautic., tech. class 2 pressure vessel (PV-2)
1 级压力容器
nautic., tech. 1 class pressure vessels
I 级压力容器
nautic., tech. class 1 pressure vessel (PV-1)
III级压力容器
nautic., tech. class 3 pressure vessel (PV-3)
级压力容器: 3 phrases in 2 subjects
Nautical2
Technology1