Conclusion the tested wild strains had resistances to all 3 kinds of insecticides but their resistancefactors to DDT were close to the normal strain.
结论现场品系对3种杀虫剂均产生了不同程度的抗性，但滴滴涕的抗性指数接近于正常品系。
2
The empirical equations for predicting heat transfer coefficients and fluid resistancefactors are given by the multi-element linear regression method.
并用多元回归法整理出计算传热与阻力系数的经验并联式。
3
Windy days and temperature are composed of the impetus factors of dust storm, and vegetation coverage and precipitation are the main resistancefactors.