喷浆层俯喷时一次喷射厚度要求不超过（）cm。
A、2～3
B、3～4
C、5～6
D、6～7
参考答案：C
— Do you think the weather is good enough for an outing?
— Yes, you couldn't hope for _____ at the time of the year. [ ]
A. a nice day
B. the nicer day
C. a nicer day
D. the nicest day
