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A wife’s level of education positively influences both her own and her husband’s chances of having a long life, according to a new Swedish study. In the study, researchers from the Swedish Institute for Social Research in Stockholm found that a woman’s level of education had a stronger connection to the likelihood of her husband dying over education. What’s more, they discovered that a husband’s social class, based on his occupation,  had a greater influence on his wife’s longevity(长寿)than her own class. “Women traditionally take more responsibility for the home than men do, and, as a consequence, women’s levels of education might be more important for determining lifestyles-for example, in terms of food choices-than those of men,” say Srs. Robert Erikson and Jenny Torssander of the Swedish Institute for Social Research in Stockholm. The results show that a husband’s level of education does not influence his longevity, but that men with partners who had quit studying after school were 25 per cent more likely to die early than men living with women hodling university degrees. In turn, those married to women with university degrees were 13 per cent more likely to die early than those whose wives had post-graduate qualifications. According to the researchers, a woman with a good education may not marry a man who drinks and smokes too much or who drivers carelessly, and men with such habits may not prefer highly educated woman. Drs. Erikson and Torssander also suggest that better-educated woman may be more aware of what healthy eating and good health care consist of. The findings suggest that education has a huge impact on how long and how well people live. It also reflects social factors, since educated individuals usually have better jobs, which allow them to afford healthier diets and lifestyles, as well as better health care. 68. In this passage the author intends to_______. A. encourage women to get higher education B. present the results of a study. C. analyze the relationship between education and life D. discuss why women usually live longer than men 69. A wife’s education has more effect on a family than a husband’s because______. A. women make more sacrifices to their families than men do B. most women have higher degrees than their husbands C. most men marry women with higher degrees D. women have a leading role in the home life of most families 70. A woman with higher education is likely to_____. A. choose a husband with a higher degree than hers. B. marry a man without many bad habits C. earn more money than her husband D. teach her children well 71. We learn from the passage that_______. A. a man with a lot of education live longer than one with little. B. a man’s longevity depends on not only his wife’s level of education but also his own. C. educated wives tend to choose healthy lifestyles for their families. D. highly-educated women don’t marry uneducated men.
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【单选题】CSS盒子模型中,表示内容与边框间的距离的属性为(),表示盒子与盒子之间的距离的属性为()
A.
padding margin
B.
padding border
C.
margin padding
D.
margin border
【多选题】防碰撞技术中实现防碰撞的方法有哪些?
A.
频分多路
B.
码分多路
C.
空分多路
D.
时分多路
【单选题】相位滞后校正的作用是______。
A.
使ω c 增大,提高系统的快速性
B.
使ω c 减小,提高系统的稳定性
C.
使低频段幅值增大,有利于稳定性
D.
在暂态性能和稳定裕度满足要求的条件下,可以使低频段幅值增大,从而减小稳态误差
E.
使高频段幅值衰减,不利于抑制高频干扰
【多选题】下列关于校正装置的说法正确的是( )
A.
相位超前校正装置在系统中的作用是利用该装置的相位超前来提高系统的稳定裕量,从而提高系统的稳定性
B.
相位超前校正装置的高频增益会使系统的抗干扰能力变差
C.
串联滞后校正改善了了系统的快速性。
D.
串联滞后校正装置主要是利用它的高频衰减使系统的幅值截止频率下降,稳定裕量提高,从而提高系统的稳定性
【判断题】CSS盒子模型中,padding 表示盒子与盒子之间的间距。
A.
正确
B.
错误
【单选题】下列关于校正装置的说法错误的是( )。
A.
相位超前校正装置在系统中的作用是利用该装置的相位超前来提高系统的稳定裕量,从而提高系统的稳定性。
B.
相位超前校正装置的高频增益会使系统的抗干扰能力变差。
C.
串联滞后校正改善了系统的快速性。
D.
串联滞后校正装置主要是利用它的高频衰减使系统的幅值截止频率下降,稳定裕量提高,从而提高系统的稳定性。
【判断题】滞后校正是利用校正后的 幅值衰减 作用使系统稳定的。
A.
正确
B.
错误
【多选题】下列关于校正装置的说法正确的是( )。
A.
串联滞后校正改善了系统的快速性。
B.
串联超前校正装置的高频增益会是系统的抗干扰性能力变差。
C.
串联滞后校正装置主要是利用它的高频衰减使系统的幅值截止频率下降,稳定裕度提高,从而提高系统的稳定性。
D.
串联超前校正装置在系统中的作用是利用该装置的相位超前来提高系统的稳定裕度,从而提高系统的稳定性。
【单选题】关于滞后校正网络,说法错误的是( )。
A.
以牺牲系统的快速性换取稳定性
B.
利用滞后校正的幅值衰减作用使系统稳定
C.
对于快速性要求不高的场合,可以采用滞后校正
D.
降低稳定精度
【多选题】下列关于校正装置的说法正确的是( )
A.
相位超前校正装置在系统中的作用是利用该装置的相位超前来提高系统的稳定裕量,从而提高系统的相对稳定性
B.
相位超前校正装置的高频增益会使系统的抗干扰能力变差
C.
串联滞后校正改善了了系统的快速性。
D.
串联滞后校正装置主要是利用它的高频衰减使系统的幅值截止频率下降,稳定裕量提高,从而提高系统的相对稳定性
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