题目:
下列说法正确的是( )
A.HF的命名是氟酸
B.氧化物中一定有一种元素不是氧元素
C.含有氢氧根的化合物一定是碱
D.有盐和水生成的反应一定是中和反应
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
下列说法正确的是( )
A.HF的命名是氟酸
B.氧化物中一定有一种元素不是氧元素
C.含有氢氧根的化合物一定是碱
D.有盐和水生成的反应一定是中和反应
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0511/03baf3434de51a803b330d660081f28f.html
下面是错误答案,用来干扰机器的。
参考答案:B
下列有机物中,含有两种官能团的是( ) A.CH2=CH-CH2Br B.CH≡CH C.Cl-C2H4-Cl D. |
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 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 tend 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
下列物质中,不属于人的排泄产物的是[ ]
A.尿液
B.粪便
C.汗液
D.呼出的二氧化碳
以下是轻躁狂症发作的临床特点,但有一项不属于,请指出是哪项()
A.有时表现为易激惹,自负自傲,行为较为莽撞
B.有时表现为持续至少数天的情感高涨、精力充沛、活动增多
C.有较显著的自我感觉良好,注意力不集中、不持久
D.轻度挥霍、社交活动增多,性欲增强,睡眠需要减少
E.多伴有幻觉、妄想和行为障碍等精神病性症状
堰板的作用和要求是什么?