回归直线的比较
参考答案:
检验回归直线两个参数斜率b和截距a是否发生显著的变化。
—Do you know _________ the meeting?
—Tomorrow morning.
A.when they had
B.when they are going to have
C.when did they have
D.when are they going to have
下述哪项最有助于鉴别细菌性痢疾和溃疡性结肠炎()
A.有无里急后重
B.有无脓血便
C.有无便血
D.抗生素治疗是否有效
E.有无发热