【简答题】Complete the following sentences with appropriate phrases from the box. Change the form if necessary. assist perform phase adapt specific trait superior make em...
【单选题】I doubt he will come here on time.
【单选题】I doubt he will succeed.
【单选题】设连续型随机变量X的概率密度p(x),则当( )时, 称其为随机变量X的数学期望