更多“What does the phrase “clam up” in Paragraph 2 probably mean?A. become excitedB. show r ”相关问题
  • 第1题:

    已知Lxx=∑(x-mean(x))2=400,Lyy=∑(y-mean(y))2=3000,Lxy=∑(x-mean(x))·(y-mean(y))=-1000;则相关系数r=()。注:mean(x)、mean(y)分别为x,y的均值。

    A.0.925

    B.-0.913

    C.0.957

    D.0.913


    参考答案:B

  • 第2题:

    X线平均波长(λmean)与最短波长(λmin)的关系是

    A.λmean=3λmin

    B.λmean=2.5λmin

    C.λmean=2λmin

    D.λmean=1.5λmin

    E.λmean=λmin


    正确答案:B
    B。X线平均波长(λmean)与最短波长(λmin)的关系是λmean=2.5λmin

  • 第3题:

    投点试验计算Ln2,编写成R模拟程序如下 MC.ln2 <- function(n){ x = runif(n,1,2) y = runif(n,0,1) sum(y < 1/x ) / n } MC.ln2(10000) 这是一次模拟,如果进行1000次模拟再平均,R语句如何实现?

    A.ys = replicate(1, MC.ln2(1000)) mean(ys)

    B.ys = replicate(100, MC.ln2(1000)) mean(ys)

    C.ys = replicate(1000, MC.ln2) mean(ys)

    D.ys = replicate(1000, MC.ln2(1000)) mean(ys)


    ys = replicate(1000, MC.ln2(1000)) mean(ys)

  • 第4题:

    What _______ “Mr” mean?

    A. is

    B. does

    C. Do


    参考答案:B

  • 第5题:

    4.—_________ Mike________ his homework in the evening?

    —No,he doesn't.

    A. Do;does

    B. Does;do

    C. Do;do

    D. Does;does


    正确答案:B
    4.B【解析】考查实义动词的疑问式为“Does+主语+do,故选B。

  • 第6题:

    Miller金字塔模型描述临床技能评价方法,从底到顶的四个层次分别为()

    A.DOES- KNOW HOW- KNOW-SHOW

    B.KNOW-KNOW HOW- SHOW- DOES

    C.KNOW-KNOW HOW- DOES- SHOW

    D.DOES- KNOW- KNOW HOW- SHOW


    A下P204