The surface contact fatigue strength of medium hard gears of vanadium-titanium nodular cast iron was studied by Grouping method. A great number of data for this type of gears were first obtained in the world. The reliablity-fatigue curves of the gears were drawn as well, which provide the basis for the reliablity design of gears.
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Method: by adopting grouping and comparison methods, to compare pain degree of patients accepted HCG intramuscular injection taking either normal saline or water for injection as dissolvent.
采用分组对照法，比较生理盐水和注射用水作为绒毛膜促性腺激素溶媒肌肉注射时的疼痛程度。
Method: The test was performed by grouping antitheses.
方法：采用分组对照的方式进行试验。
By combining the continuous power flow method with improved differential evolution calculation, the static voltage stability margin is found via optimal grouping of relevant variables.
在连续潮流法的基础上，结合经过改进的差异进化算法，通过对变量的组合优化，求取系统静态电压稳定安全裕度。
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