病历摘要：患者男78岁，肠梗阻手术后，因多器官功能衰竭，被送入ICU

有关肾功能衰竭，以下的说法正确的是（）

A.预防措施应将改善心血管功能放在首位

B.小剂量多巴胺可增加尿量而不增加心排血量

C.补充胶体比晶体更重要

D.应维持0.5～1ml／（kg·h）的尿量

E.应控制诱发肾衰竭的原发疾病

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (41) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (42) , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (43) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (44) . As an example, gateways between Internet E-mail and X.400 E-mail must (45) the E-mail message and change various header fields.

A．analyze

B．parse

C．delete

D．create