threaded inspection opening
... Threaded connection 螺纹连接 Threaded inspection openings 螺纹检查孔 Threads，在整定安全阀时，和壳体的装配 ...
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设计了能在高辐射环境下工作的、全自动检查核电站反应堆压力壳连接处法兰面主螺栓孔螺纹表面缺陷的设备，解决了自动小车的设备承载和准确定位问题。
To inspect the defects on the screw hole surfaces of nuclear reactor pressure vessel in nuclear power station, an automatic moving table was designed to carry sophisticated inspecting devices.
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