... main rod 摇杆; 主杆; 主连杆 driving box wedge bolt 动轮轴箱楔螺栓 frame wedge bolt 滑楔螺栓 ...
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前臂、后臂、辅臂以及插件与主杆之间为活动连接， 均可折叠于主杆上。
The front arm, the rear arm, the auxiliary arm and the plug-in are movably connected with the main rod and can be folded on the main rod.
本实用新型公开了一种主杆可弯折的伞，旨在提供一种结构简单、使用方便的主杆可弯 折的伞。
The utility model discloses an umbrella, the trunk of which could be bended, and aims to provide the umbrella with the bended trunk which is simple in structure and easy to use.
本实用新型提供一种整体式采油气树，其特征是四通和相互连接的主杆为一个空心长方体的整体锻压件；
The utility model provides an integral petroleum production tree, which is characterized in that a pipe cross and mutually connected main bars are a hollow and cuboid integral forging piece;
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