What did he do with his old car().

A.He maintained the old car.

B.He planned to replace the old car.

C.He discarded the old car.

D.He had his old car fixed.

下列哪种是多器官功能障碍综合征的病因()

A．输液过多

B．机体抵抗力明显低下

C．大手术创伤

D．吸氧浓度过高

E．单核吞噬细胞系统功能明显低下