企业的采购业务采用必有订单模式时，采购订单是整个采购业务的核心，整个业务的执行情况都反馈到采购订单，通过采购订单可以跟踪采购的整个业务流程。
正确
错误

A．Stability of long-distance railway Combined with road transport flexibility
B．Speed of air transportation combined with flexibility of road transportation.
C．The economy of shipping, large capacity combined with the flexibility of road transport.
D．Long distance transportation through the river.

A．A．膜性增生性肾小球肾炎
B．B．膜性肾小球肾炎
C．C．轻微病变性肾小球肾炎
D．D．毛细血管内增生性肾小球肾炎
E．E．以上都不是