And base on the experiment, calculating formula of cross section mean velocity's reduction after planting and bed shears stress of vegetation dam block are established.
同时在试验的基础上，推导得植树后断面平均流速减小值和植物坝段床面剪应力的计算公式。
2
The modified formula brings about obvious effect in reduction of equipment cost, decrease of power consumption.
修改后的公式对于减少设备费用、节约动力消耗，效益是可观的。
3
The formula of final error in the oxidant reduction titration is deduced according to the principle that the inconsistency of titrating final and chemical calculating point leads to the final error.