衡量和评价企业购入存货、投入流通、销售收回等各环节的综合性指标是（）。
参考答案：存货周转次数
— Look! Everything here is under construction.
— Oh, it has the museum once_________for exhibitng art works been pulled down,too. [ ]
A. being built
B. been built
C. having been built
D. built
简述应激反应的发展阶段？
