水痘的传染期（）。
A.发热至痂脱落
B.出疹至痂脱落
C.潜伏期至疱疹结痂
D.出疹前1～2天至疱疹结痂为止
E.前驱期及疱疹结痂
参考答案：D
—Where is Paul's red jacket?
—_____. [ ]
A. Sorry, I don't know
B. Yes, it is
C. I like it
D. No, it isn't
陀螺施工开始和结束时天滑轮的安装和拆卸由谁负责？
