... fine thread 细牙螺纹 fine thread screw 细牙螺钉 fine tuning 精细调谐 ...
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... 高真空抽气 fine structure 细牙螺纹 fine thread screw 细牙螺钉 fine tuning ...
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fine screw thread 细螺纹
fine structure distribution thread screw 细纹螺钉
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