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问题 多项选择题

下列哪些建筑物应在施工期间及使用期间进行变形观测（）。

A.地基基础设计为甲级的建筑物

B.复合地基或软弱地基上的设计等级为乙级的建筑物

C.加层、扩建建筑物

D.接建工程

答案

参考答案：A, B, C, E

单项选择题

Astute service providers realize that the continued support of legacy X.25 and asynchronous network element using separate operations network is cost（1）. 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（2）hence,additional maintenance procedures must be maintained and administrative records are（3）the duplication of trasport facilities to carry（4）network traffic is an inefficient use of resources and,not surprisingly,more technologies installed in a central office mean the necessity for more physical space,and an increase in power connections and power consumption.migration of these（5）network elements to IP-based DCns is alogical strategy

2（）

A.line 

B.platform 

C.server 

D.switch
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选择题

中国是世界上最早发现和使用煤的国家。据考证，用煤冶铁最早是在

A．春秋战国

B．汉代

C．唐代

D．北宋
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