相贯线有哪些基本特征?
参考答案:
相贯线是两个物体公共有的分界线,也是单个物体的轮廓线。
—Would you like to come to dinner this Sunday, Xiao Ming?
—________. [ ]
A. I'd love to, but I have lots of things to do.
B. Oh, no. That'll be too tired.
C. I'll stay at home.
D. Yes, please.
疾控中心的职责是()
A.制定传染病防治规划
B.实施传染病预防控制规划、计划和方案
C.决定增加或减少法定管理传染病的病种
D.成立应急处理指挥部
E.封锁疫区