某传染病在某地发病率水平显著高于一般水平时称()
A.暴发流行
B.流行
C.大流行
D.小流行
E.散发性发病
参考答案:B
How many of us ____ a meeting that has nothing to do with us is not important at all.
A.attending
B.to attend
C.have attended
D.attend
曲流河沉积可以划分为()
A.心滩亚相、天然堤岩相、决口扇亚相、泛滥平亚相
B.边滩亚相、天然堤岩相、决口扇亚相、泛滥平亚相
C.河床亚相、堤岸亚相、河漫亚相、牛轭湖亚相
D.河床亚相、边滩亚相、河漫亚相、牛轭湖亚相