某施工单位承建一居民楼，现浇混凝土框架结构，自拌C30混凝土，内隔墙采用加气混凝土砌块，双坡屋面，防水材料为3mm厚SBS防水卷材，外墙为玻璃幕墙。生产技术科编制了安全专项施工方案和环境保护方案。1层混凝土浇捣时，项目部对现场自拌混凝土容易出现强度等级不够的质量通病，制订了有效的防治措施。1层楼板混凝土浇筑完毕后，质检人员发现木工班组不按规定拆模。
该工程屋面的卷材防水的基层应做成圆弧的有（）。

A.是奇函数
B.既不是奇函数也不是偶函数
C.既是奇函数又是偶函数
D.是偶函数

A．Because she didn't like its design.
B．Because the burglar alarm system had broken down.
C．Because she considered monthly fee unnecessary.
D．Because she thought their home security was not a problem.

A．Children from low-income families are unable to bootstrap their way to the top.
B．Hollywood actors and actresses are upwardly mobile from rags to riches.
C．The rags to riches story is more fiction than reality.
D．The rags to riches story is only true for a small minority of whites.