According to the principle of four bar linkage mechanism, the new style thread inspecting stand for oil tubes is designed.

根据平面四连杆机构原理设计了新型石油套管螺纹检查台。

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According to the principle of four bar linkage mechanism, the new style thread inspecting stand for oil tubes is designed.

根据平面四连杆机构原理设计了新型石油套管螺纹检查台。

youdao