Research was conducted from 2002 through 2004 to evaluate the effects of variety, nitrogen rate, topping height, and separation of the upper-stalk tobacco at harvest on production of tip grades.
为了评估品种、氮用量、打顶高度和上部叶分次采收对生产顶叶等级的影响，从2002 - 2004年进行了研究。
Using GDT14/2.5G vibro_assisted jig replace selecting coal by hands can lift the rate of discharging refuse, improve separation, conditions, reduce production cost and increase the economic benefit.
以GDT1 4 /2 5G型动筛跳汰机代替人工手选，提高了排矸率，改善了分选条件，降低了生产成本，增加了经济效益。
Compared with ceramic Raschig rings, the production rate of the new packing increases the production rate significantly with a slightly higher separation ef...
生产实践证明，这种金属开窗环填料与原用同样外形尺寸的拉西环填科相比，不仅生产量有较大辐度的提高而且分离效率也略有增长。
应用推荐