Experimental data of moving sand grains are introduced and the turbulent structure of flow is investigated by laser current meter.
本文采用激光流速仪对挟带推移质水流的紊流结构进行了较系统的试验研究。
The Weatherford STP helps you reduce sand damage by moving sand upward through the pump and away from the barrel/plunger interface.
STP可使砂粒向上移动，远离泵筒和泵塞泵接触面，从而减少砂粒引发的磨损。
The analysis to sandy desertification land types shows that the moving sand dune decreases, semi-fixed sand dune and fixed sand dune increase.
从沙化土地类型上分析，流动沙地面积减少，半固定、固定沙地面积增加。
The analysis to sandy desertification land types shows that the moving sand dune decreases, semi-fixed sand dune and fixed sand dune increase.
从沙化土地类型上分析，流动沙地面积减少，半固定、固定沙地面积增加。
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