饲料酵母在猪的日粮中一般不超过10%。
参考答案:对
She _____me only twice since last year. [ ]
A. sees
B. was seeing
C. has seen
D. have seen
采用正态近似法估计总体率的置信区间,要求()
A.n≥50
B.p不接近0
C.p接近0.50
D.np或n(1-p)大于5
E.np与n(1-p)均大于5