我国饮水氟适宜浓度以下哪项较为适宜
A.1.0ppm
B.0.5ppm
C.0.8ppm
D.0.5~0.8ppm
E.0.8~1.0ppm
参考答案:E
---Would you like _____________ more cakes?
---No, thanks. I am full. I don't want ____________ cakes. [ ]
A. some, any
B. any, some
C. some, some
D. any, any
制备阿胶时,胶汁一般应能通过()
A.四号筛
B.五号筛
C.六号筛
D.七号筛
E.八号筛