Allherhardwork__________intheend,andshefinallypassedtheexam.
曲线y=|x|与直线y=2所围成的平面图形的面积为()
设随机变量(X,Y)服从二维正态分布,且X与Y不相关,f(x)f(y)XY分别表示X,Y的概率密度,则在Y=y的条件下,X的条件概率密度fX|Y(X|Y)为()
Themanageriscallingona______customertryingtotalkhimintosigningthecontract.
ComradeLi________beinBeijingbecauseIsawhimintownonlyafewminutesago.