【单选题】某幼儿园大班11名6岁儿童接受百白破疫苗注射后,做血清抗体测定,其抗体滴度分别是1:20,1∶20,1∶40,1∶40,1∶80,1∶80,1∶160,1∶160,1∶320,1∶640,描述抗体滴度的集中趋势的指标应选用
【单选题】设α 1 ,α 2 是非齐次线性方程组 Ax=b 的解,又已知 k 1 α 1 +k 2 α 2 也是 Ax=b 的解,则 k 1 +k 2 =__________.
【单选题】某幼儿园大班1名6岁儿童接受百白破疫苗注射后,其抗体滴度分别是1:20,1:20,1:20,1:40,1:40,1:80,1:80,1:160,1:160,1:320,1:640,描述其抗体滴度的集中趋势的指标应选用
【简答题】Recently, a professor of philosophy in the United States has written a book called Money and the Meaning of Life . He has discovered that how we deal with money in our daytoday life has more meanin...
【单选题】已知4己非齐次线性方程组Ax=b的系数矩阵的秩等于3,且η 1 ,η 2 ,η 3 是3个不同的解向量,则通解是______.
B.
x=k 1 η 1 +k 2 η 2 +η 3
C.
x=k 1 η 1 +k 2 η 2 +k 3 η 3
【单选题】病人持续发热2周,相对缓脉,曾于胸部呈现玫瑰疹。后因消化道大出血继发休克死亡。尸检发现回肠末段集合淋巴滤泡增生。图片显示该处肠黏膜内的结节状病灶(高倍镜),请注意箭头所指处细胞(胞质内含有淋巴细胞)。此结节状病灶由下列何种细胞组成()
【简答题】Writer Joseph Heller died of a _1__ __2_ when he was 76 years old. Joseph Heller was famous for writing a book called Catch-22. It was about life in the American __3_ during World War II. The book mad...
【简答题】Recently a professor of philosophy(哲学)in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our day to day life has more meanin...