男性，52岁，患慢性骨髓炎6个月，血红蛋白75g／L，白细胞、血小板正常。血清铁6．23μmol／L，铁蛋白200μg／L，骨髓增生活跃，细胞外铁（++）

该病的发病机制描述不正确的是（）

A.机体造血储备能力降低

B.红细胞生成素相对不足

C.单核一巨噬细胞释放内铁障碍

D.红细胞干细胞凋亡过早

E.细胞利用铁障碍

A project management team wants to procure some customized products which are available in identical grade and quality from many vendors．What should be included in the procurement package to ensure that their offers will be comparable ？（）

A．A statement of work describing the needs of the project in sufficient detail to enable vendors to make suitable proposals

B．A statement of work specifying attributes and metrics of the requested deliverables in detal to allow vendors Submission of bids

C．The approved project scope statement，the WBS which should be broken down to work package level and the WBS dictionary

D．The risk management plan and the reports from those risk management reviews which have been made so far