On a holiday, people __________ work.[ ]
A. isn't
B. aren't
C. don't
答案：C
当屋面玻璃使用夹层玻璃时，夹层玻璃其胶片厚度不应小于（）mm。
A.0.7
B.0.75
C.0.76
D.0.8
干酪样坏死(caseous necrosis)
