The plastic extension pipe with a joint coupling body can bring convenience for the installation of a ventilator, a range hood, a water heater, etc.

在安装通风装置、脱排油烟机、热水器等时，使用这种带接头联体的塑料伸缩管在许多方便之处。

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Based on mode field coupling theory, a model to calculate the butt-joint coupling efficiency between a multi-mode fiber and a single-mode fiber is presented.

采用模场耦合理论，推导出多模光纤与单模光纤的直接耦合效率表达式，计算得到耦合效率与所选用的多模光纤和单模光纤的纤芯芯径之间的模拟关系。

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Universal joint balancing machine: coupling drive is the use of universal joints will balance the spindle and the rotor connected.

万向节平衡机：联轴器拖动是利用万向节将平衡机主轴与转子相联接。

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