某大城市郊区某28层的高层建筑,如图6-3所示。地面以上高度为90m,平面为一外径2

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问题:

某大城市郊区某28层的高层建筑,如图6-3所示。地面以上高度为90m,平面为一外径26m的圆形。基本风压数值为0.50kN/m2,风荷载体型系数为0.8。

 

已知屋面处的风振系数β90=1.68,则屋面高度处的风荷载标准值wk,最接近于()kN/m2

A.1.730

B.1.493

C.1.357

D.1.271

考点:二级注册结构工程师二级注册结构工程师
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干吸塔出酸管沉插入循环酸槽液面以下的主要目的有()。

A.稳定循环槽液位

B.稳定循环酸流量

C.形成液封,隔绝循环槽与干吸塔内气相连通

D.使循环酸槽内酸尽快混合均匀

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Multitasking

People who multitask all the time may be the worst at doing two things at once, a new research suggests. The findings, based on performances and self-evaluation by about 275 college students, indicate that many people multitask not out of a desire to increase productivity, but because they are easily distracted (分心) and can’t focus on one activity. And “those people turn out to be the worst at handling different things,” said David Sanbonmatsu, a psychologist at the University of Utah.

Sanbonmatsu and his colleagues gave the students a set of tests and asked them to report how often they multitasked, how good they thought they were at it, and how sensation-seeking (寻求刺激) or imperative (冲动) they were. They then evaluated the participants’ multitasking ability with a tricky mental task that required the students to do simple mathematical calculations while remembering a set of letters.

Not surprisingly, the scientists said, most people thought they were better than average at multitasking, and those who thought they were better at it were more likely to report using a cellphone while driving or viewing multiple kinds of media at once. But those who frequently deal with many things at the same time were found to perform the worst at the actual multitasking test. They also were more likely to admit to sensation-seeking and impulsive behavior, which connects with how easily people get bored and distracted.

“People multitask not because it’s going to lead to greater productivity, but because they’re distractible, and they get sucked into things that are not as important.” Sanbonmatsu said.

Adam Gazzaley, a researcher at the University of California, San Francisco, who was not a member of the research group, said one limitation of the study was that it couldn’t find out whether people who start out less focused   toward multitasking or whether people’s recognizing and understanding abilities change as a result of multitasking.

The findings do suggest, however, why the sensation-seeker who multitask the most may enjoy risky distracted driving. “People who are multitasking are generally less sensitive to risky situations.” said Paul Atchley, another researcher not in the group. “This may partly explain why people go in for these situations even though they’re dangerous.”

小题1: The research led by Sanbonmatsu indicates that people who multitask       .

A.seek high productivity constantly

B.prefer handling different things when getting bored

C.are more focused when doing many things at a time

D.have the poorest results in doing various things at the same time小题2:When Sanbonmatsu and his colleagues conducted their research, they          .

A.assessed the multitasking ability of the students

B.evaluated the academic achievements of the students

C.analyzed the effects of the participants’ tricky mental tasks

D.measured the changes of the students’ understanding ability小题3:According to Sanbonmatsu, people multitask because of their        _.

A.limited power in calculation

B.interests in doing things differently

C.inability to concentrate on one task

D.impulsive desire to try new things小题4: From the last paragraph, we can learn that multitaskers usually____  .

A.drive very skillfully

B.go in for different tasks

C.fail to react quickly to potential dangers

D.refuse to explain the reasons for their behavior

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各国在推行医疗保险制度上存在着不同的模式,其中主要有:()

A、以日本为代表的储蓄医疗保险

B、以英国为代表的国家医疗保险

C、以德国为代表的社会医疗保险

D、以新加坡为代表的储蓄医疗保险

E、以意大利为代表的福利医疗保险

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孕妇在妊娠期感染风疹,胎儿可(),并出现()。

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在对文件进行粘贴之前必须先______。

A.修改

B.重命名

C.复制

D.打开

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