To realize artesian discharge, there must be a certain height of liquid level, or an adequate level difference between the liquid stored and the outlet of unloading arm.

要实现自流付油，油品就必须有一定的液面高度，也就是要求储存油品液面与发油鹤管出口具有足够的高度差。

youdao

The moving theory of four bar linkage is often used to analyze the triangular arm unloading mechanism of dump truck.

重型自卸汽车设计中经常选用三角臂组合式倾卸机构，应用的是铰链四连杆机械运动工作原理。

youdao

In this article, the analysis on the causes and influence factors of vapor lock of railway swing arm for unloading oil are carried out, and a computational practical example is given.

分析了铁路卸油鹤管气阻产生的原因和影响因素，并给出了分析计算实例。

youdao

If NASA gives the go-ahead, the crew will use the arm to attach the capsule to the station and begin unloading supplies, according to SpaceX.

CNN: Historic launch of private rocket heralds new era