患者，男性，22岁，某工地建筑工人。3小时前不慎从约6米高处摔下，腹部先着地，意识清楚，自觉腹痛，头晕，四肢活动自如，被同伴送医院急诊。

肝破裂手术后主要的并发症有（）。

A.出血

B.腹腔感染

C.肺部感染

D.腹腔脓肿

E.体温过高

F.下肢深静脉血栓形成

Astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost(16).For example,the maintenance of multiple networks can require additional staff. Often, this staff must be trained on multiple vendor technologies, sometimes requiring parallel groups specializing in each (17) .Hence, additional maintenance procedures must be maintained and administrative records are (18) .The duplication of transport facilities to carry (19)network traffic is an inefficient use of resources. And not surprisingly, more technologies installed in a central office means the necessity for more physical space, and an increase in power connections and power consumption migration of these (20) network elements to IP-based DCns is alogical strategy.

空白处（17）应选择（）

A.line

B.platform

C.sever

D.switch