通过（）可以满足生产企业“零库存”生产的要求。
A.上门供货
B.提前供货
C.延时供货
D.准时供货
参考答案：D
--- How come your father can read books in German?
--- Well, he on a project with some German engineers for 3 years when he was young.
A．worked
B．was working
C．had worked
D．would work
发生医院感染与哪些因素有关（）。
A.消毒灭菌不严格和无菌技术操作不当
B.医院布局不合理和隔离设施不全
C.医务人员对医院感染认识不足
D.感染链的存在
E.控制医院感染管理制度不健全
