足外伤后13h，伤口污染，应采取的措施是（）。

A.清创后一期缝合

B.只清创不缝合

C.单纯换药

D.单纯清洗伤口

E.伤口湿敷

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.

A．same

B．similar

C．different

D．difference