... bearishmarket市场疲软 bearizing扩孔；轴承支撑面密封 beast大型火箭 ...
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The connection strength increases with the increasing of bearizing rate of coupler and thickness of pipe wall, but decreases with the increasing of connection length.
管接头的连接强度随着扩孔率、管壁厚度的增加而升高，但随着连接长度的增大而降低；
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