[单选题]A.1天B.3天C.1周D.2周E.1个月

[单选题]A.B.C.D.

[单选题]A.B.C.D.

[单选题]A.B.C.D.

[单选题]A.肝病性贫血B.原发性血小板减少性紫癜C.再生障碍性贫血D.感染性贫血E.急性白血病

[单选题]A.异方差问题B.序列相关问题C.多重共线性问题D.随机解释变量问题

[单选题]A.B.C.D.

[单选题]A.e≤b/6B.e≤b/12C.e≤b/30D.e≤b/60

[单选题]A.Ⅰ级B.Ⅱ级C.Ⅲ级D.Ⅳ级

[单选题]A.e≤b/6B.e≤b/12C.e≤b/30D.e≤b/60