正确答案:

题目：保证合同是人为保证合同的履行而同债务人签订的一种合同。（）

解析：×

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举一反三的答案和解析：

[单选题]【In the forthcoming years,Beyond-3G(B3G) environments will undoubtedly be deployed in most parts around the globe, permitting a world class solution for network interconnection, A B3G context enables the efficient cooperation of existing wireless technologies, including cellular-based(e.g. 2G/3G), broadcast-oriented(e.g. DVB)-in specific DVB-H, and Internet-based(WLAN/WMAN)networks, all relying on enhanced IP as the unifying layer. Hence, in this particular and yet to be deployed environment, mobile, systems and platforms will permit to provide enhanced services to all applications across heterogeneous access networks. This will effectively enlarge the scope of service deployment, availability and accessibility to the users】 Based on the paragraph above, it is shown that (98) will be used as the higher layer protocol to unify cellular networks ,broadcast networks and (99) networks, which is enabled by the context of (100).

enhanced IP

[单选题]关于虚呼叫业务和永久虚电路业务，错误的是().

两者均需有建立和拆线过程

[多选题]影响交换机呼叫处理能力的因素主要有()。

系统容量

系统结构

处理机能力

软件设计水平

解析：ABCD