下列关于措施费叙述正确的是( )。

A．措施项目费是自由竞争的，自主报价

B．措施项目费是非工程实体项目的费用

C．脚手架费用计入措施费

D．施工现场垃圾清运属于措施费

E．现场管理费计入措施费

The demand curves faced by monopolistic competitors is:（）

A. inelastic due to the availability of many complementary goods.

B. elastic due to the availability of many close substitutes.

C. flat due to the allocative efficiency of price searcher markets.