flat nozzle造句

• On the basis of all these , the paper researches that the soil moisture content reduces slowly after 7 days ， so establishes a main criterion of evaluating watering feature - the increment of average soil water content in 7 15 days . according to these theories , we draw an conclusion - water is injected at the position away from seed zone 3 . 5 ( cm ) , 6 ( cm ) deep with vertical flat nozzle , the effect of watering is better at the operation speed of 0 . 9m / s
  得出7天后土壤含水量呈缓慢变化的趋势，进而提出了以7 15天平均土壤含水量与初始含水量的差值作为评价坐水性能的指标，以此为依据得出在机组作业速度由0 . 5m / s增加到0 . 9m / s的情况下，采用竖扁（不带翅）施水管将所需的水施到种子带横断面内3 . 5cm ，深6cm的位置，坐水效果较为理想。