external safety valve
... external pupil telescope 外光瞳望远镜 external safety valve 外安全阀 external screw gauge 外螺纹检查规 ...
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国外安全阀手册 Safety Valve Handbook
弹簧外露式安全阀 exposed spring type safety valve
外部安全阀 external relief valve
·2,447,543篇论文数据，部分数据来源于NoteExpress
工程师打开安全阀让蒸气外逸以便降低压力。
The engineer opened the safety valve to allow the steam to escape and so reduce the pressure.
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