Astute service providers realize that the continued support

【名词&注释】

网络通信(network communication)、网络设备(network equipment)、办公室(office)、工商管理(business administration)、不规则(irregular)、提供商(provider)、经纪人(broker)、椭圆形(ellipse)、一个中心(one center)、腐蚀性灼伤(corrosive burn)

[单选题]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.

A. A

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学习资料：

[单选题]有食管灼伤史，X线呈不规则细线状狭窄（）

A. 食管癌
B. 贲门失弛缓
C. 食管腐蚀性灼伤^{(corrosive burn)}
D. 食管憩室
E. 食管平滑肌瘤

[单选题]合法经纪人^(broker)是指经（）部门批准的。

A. 工商管理
B. 行政管理
C. 工商行政
D. 工商行政管理

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