题目内容

超声的横向分辨力与下述哪项因素最有关

A. 超声波长(λ)或频率(f)
B. 扫描声束
C. 探头厚度方向上的声束宽度及其聚焦性能
D. 超声脉冲宽度
E. 声场的远近及其能量分布

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It seems intuitive that going to a specialist physician will result in more thorough and up-to-date care for whatever ails you. In fact many studies support this idea — but health-care researchers caution that they may not tell the whole story. The first question is whose patients are sicker Specialists tend to treat more complicated forms of disease but generalists — family physicians and general practitioners — are more likely to treat patients with several coexisting diseases. A second question is what counts as the most valuable treatment Specialists are more familiar with standards of care for the diseases they treat regularly, says Harlan M. Krumholz of Yale University. On the other hand, a generalist may do a better job of coordinating a patient"s care and keeping an eye on a person"s overall health, says Martin T. Domohoe of the Oregon Health Sciences University in Portland. To further complicate comparisons many generalists will consult with specialists on complicated cases but medical records do not always show that, says Carolyn Clancy of the Agency for Health Care Policy and Research in Rockville, Md. That said stroke patients treated by neurologists are more likely to survive than stroke patients treated by generalists. Among about 38,000 stroke sufferers nationwide, 16.1% of those treated by a neurologists died within 3 months compared with 25.3 percent of those treated by family physicians. Several studies have shown that people with heart disease fare better when they are treated by cardiologists, says S. Nash of the Mount Sinai Medical Center in New York. But it"s hard to figure out exactly why. "Physician specialty, in addition to being a measure of formal training in the field, is also a proxy for clinical experience." he says, "It"s very difficult to separate out the overlapping concepts. One, that practice makes perfect; two, the effect of the educational and time investments in a clinical problem the physician is simply interested in; and three, the issue of formal training." Differences between specialist care and generalist care, however. Pale in comparison with the finding that both specialists and generalists often fail to put the latest knowledge into practice, contend both Donohoe and Clancy. A report by the US General Accounting Office documented that heart attack survivors who saw cardiologists regularly were more likely to take cholesterol-lowering drugs and beta blockers which reduce heart rate and blood pressure than those who received care from a generalist. Even so, these life-prolonging drugs were not prescribed to many patients who appeared to be eligible for them, implying that both generalists and specialists could do better. "Maybe we are focusing too much energy on the differences between generalist and specialist care," says Donohoe. Perhaps, he adds, "We should focus more intently on improving the quality of communication between generalists and specialists and on developing and promoting practice guidelines that might have a much bigger effect on the overall health of Americans." Donohoe is trying to shift our attention to______.

A. better communication and cooperation between generalists and specialists
B. the real nature of specialist and generalist care respectively
C. the similarities between generalist and specialist care
D. the declining health of Americans

Are smart people just naturally attracted to study art or perform music, dance, or drama Or does early education in the art actually cause changes in the brain that develop important components of cognition Recent findings show that there may be some significant causal relationships between arts training and the brain"s ability to learn. The Dana Foundation, an organization with interest in neuroscience, immunology, and arts education, just released a three-year study that found that early training in the arts is possibly good for your brain. Neuroscientists and psychologists at several universities have now enhanced understanding of just how the arts might improve thinking, memory, and language skills. Music education is linked with the ability to control both short-term and long-term memory, geometric representation, and development of reading skills. Dance training improves thinking though mimicry and acting classes seem to expand language. Visual arts lessons outside the classroom in childhood are linked to improved math calculations. In retrospect, I wish I had more art lessons before I took on that advanced math class in high school. It"s not a new idea that the arts can make us smarter. The notion caught fire in the 1990s when researchers showed that college students did better on certain math tests" after listening to a little bit of Mozart. And while the current report from the Dana Foundation did not provide definite theories as to how arts make us smart, what it does is to end the popular notion that people are either right-or left-brain learners. Apparently artists are not that fundamentally different and perhaps there is even an underlying connection between the cognitive processes that give rise to both arts to both arts and sciences. What can be inferred about the author"s art lessons during childhood

A. They are proficient.
B. They are deficient.
C. They are popular
D. They are various.

下列各项中,属于会计核算软件应当具备的初始化功能的有______。

A. 输入会计核算所必需的期初数据
B. 输入需要在本期进行对账的未达账项
C. 选择会计核算的方法
D. 用户设置

Are smart people just naturally attracted to study art or perform music, dance, or drama Or does early education in the art actually cause changes in the brain that develop important components of cognition Recent findings show that there may be some significant causal relationships between arts training and the brain"s ability to learn. The Dana Foundation, an organization with interest in neuroscience, immunology, and arts education, just released a three-year study that found that early training in the arts is possibly good for your brain. Neuroscientists and psychologists at several universities have now enhanced understanding of just how the arts might improve thinking, memory, and language skills. Music education is linked with the ability to control both short-term and long-term memory, geometric representation, and development of reading skills. Dance training improves thinking though mimicry and acting classes seem to expand language. Visual arts lessons outside the classroom in childhood are linked to improved math calculations. In retrospect, I wish I had more art lessons before I took on that advanced math class in high school. It"s not a new idea that the arts can make us smarter. The notion caught fire in the 1990s when researchers showed that college students did better on certain math tests" after listening to a little bit of Mozart. And while the current report from the Dana Foundation did not provide definite theories as to how arts make us smart, what it does is to end the popular notion that people are either right-or left-brain learners. Apparently artists are not that fundamentally different and perhaps there is even an underlying connection between the cognitive processes that give rise to both arts to both arts and sciences. At the beginning of the passage, two questions are raised to explore the relation between______.

A. early education and the future
B. intelligence and emotional quotient
C. art training and cognitive development
D. the human brain and its cognitive components

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