Downward vertical tube 垂直下降管
downward vertical weld 向下立焊焊缝
vertical downward welding 向下立焊
downward directed vertical wall jets 竖壁贴附送风
vertical downward flow 垂直下降流
vertical-downward welding 从上到下立焊
vertical downward pipeflow 垂直下降管流
Vertical downward flow wetland 垂直下行潜流湿地
The downward vertical movement of filtrate with time after invasion.
泥浆侵入地层后的下沉垂直移动。
At the same time, there is a considerable downward vertical motion over the oases, which contributes to the transportation of energy and vapor in oases.
同时，绿洲与周围荒漠相比有比较可观的下沟运动，这会对绿洲的能量和水分输送有贡献。
The void fraction in downward gas oil two phase flow in vertical tube is measured with the combined method of horizontal downward vertical tube for the two flow regimes(bubbly and slug flow).
采用水平—下降管组合法测量了垂直下降管内油气两相流动在泡状和弹状流下截面含气率的值。
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