The drag of flow in pipes can be greatly reduced by adding a very small amount of high molecular polymer to water.
在清水里加入微量的高分子聚合物，可以大大降低管路阻力。
Drag this operator to the right of the existing data flow operator.
把这个操作符拖到现有数据流操作符的右边。
Drag it onto the left side of the empty data flow.
将它拖放到空白数据流的左侧。
应用推荐