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问题 单项选择题

某购物中心大楼建筑面积3.5×105m2。大楼地上8层(高度30m)，地下1层。楼面最大长度为90m，宽度为70m。建筑物中间部位各有一间强电间和弱电间。对该购物中心大楼第5楼层进行结构化综合布线现场勘探时，测得距离配线间最近的信息点约为8m，综合考虑到未来3年内业务的增长情况，该楼层约有40台计算机，则规划师可以估算出该楼层至少需要准备___8___箱超5类非屏蔽双绞线。

假设位于该购物中心大楼第6楼层的主机房遵照行业B级国家标准进行建设，机房内主设备负载的总电功率约为12KW，需要提供两小时电源供电延长保护。规划师在设计在线式不间断电源(UPS)解决方案时，预留了30%的富余量，所使用的在线式UPS的功率因数(cosφ)约为0.8，所采用的UPS蓄电池直流电压为96V。那么规划师所设计的UPS解决方案最可能是___9___。

8（）

A．3

B．4

C．5

D．6

答案

参考答案：D

改错题

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词作斜线（\）划掉。 修改：在错词下划横线，并在该词下写出修改后的词。

注意：1．每处错误及修改均仅限一词；2．只允许修改10处，多者（从第11处起）不计分。

One evening，two young men were walking in the street. They tried to find a chance to steal

everything. The clock strikes twelve. Most people were in bed. Quickly they came to a house, so it

seemed that everyone in the house had fallen sleeping. Standing at the front gate, one man said in

English to the other at a low voice, “You wait here. I will go around to the front door and then get

into the house.” Suddenly out of the house ran a dog , barked at them. The two men were very

afraid and ran away as fast as possibly. They didn’t stop until they had got to a lonely place. One

man said to the other in surprise, “It’s too bad. I had thought that the dog could understand

English.”
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选择题

每做一次焰色反应实验，都要用一种试剂洗净铂丝，这种试剂是(  )

A．Na2CO3溶液

B．NaOH溶液

C．盐酸

D．硫酸
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