bivariate multinomial distribution : 二元多项分布 factorial distribution : 因子分布 inverse factorial series distribution : 逆阶乘级数分布 ..
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分析了冷扩张对疲劳裂纹尖端应力强度因子分布的影响。
The influence of cold expansion on the stress intensity factor distribution in crack tip was also analyzed.
主要观察指标：高压氧治疗诱发脑梗死患者危险因子分布及未发生脑梗死患者危险因子水平分析。
MAIN OUTCOME MEASURES: Analysis of distribution of risk factors among cerebral infarction patients, and risk factor levels in patients without cerebral infarction.
石家庄地区SS的毒力因子分布情况不很清楚，本实验对石家庄地区SS分离株的毒力因子进行检测。
To investigate the distribution of virulence associate factors of Streptococcus suis(SS), 8 virulence factors were selected to be detected by PCR assay.
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