Compounded with other insecticides, the nicotinamide insecticide can improve the drug effect and enlarge the serviceable range.
与其它杀虫剂复配可以提高药效，扩大使用范围。
The conventional calculation formulas for excess air ratio are introduced, and the serviceable range of different formulas is put forward by means of calculation comparison.
介绍了常用的过剩空气系数计算公式，通过计算比较，提出不同公式的使用范围。
The conventional calculation formulas for excess air ratio are introduced, and the serviceable range of different formulas is put forward by means of calculation comparison.
介绍了常用的过剩空气系数计算公式，通过计算比较，提出不同公式的使用范围。
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