某流体的相对密度是0.8,其密度为()kg/m3。A、800 B、1000.8 C、

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问题:

某流体的相对密度是0.8,其密度为()kg/m3

A、800

B、1000.8

C、1008

D、1228

考点:己内酰胺装置操作工己内酰胺装置操作工(初级)己内酰胺装置操作工(初级)题库
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肝火炽盛型瘿病治疗时宜()

A.疏肝理气

B.清肝泻火

C.宁心柔肝

D.疏肝健脾

E.疏肝养心

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423×187-423×24-423×63的值是( )

A.41 877

B.42 300

C.42 323

D.42 703

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各种氯化消毒剂,能在水中水解生成次氯酸离子和次氯酸。以下有关次氯酸和次氯酸离子的叙述,正确的是()

A.二者杀菌作用相等

B.次氯酸的杀菌作用是次氯酸离子的8倍

C.次氯酸的杀菌作用是次氯酸离子的80倍

D.次氯酸离子的杀菌作用是次氯酸的8倍

E.次氯酸离子的杀菌作用是次氯酸的80倍

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财务报告企业可以根据需要不定期的编制。( )

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Going to the ballpark, visiting friends and playing bingo are simple diversions for many of us. But for the elderly, these social pastimes may play a critical role in preserving their physical and mental health.

(46) In fact, a new study suggests that the less time older people spend engaged in social activity, the faster their motor function tends to decline. "Everybody in their 60s, 70s and 80s is walking more slowly than they did when they were 25," says Dr. Aron Buchman, a neurologist at the Rush University Medical Center in Chicago and leading author of the study, which was published in the June 22nd issue of the Archives of Internal Medicine. (47) "Our study shows the connection between social activity and motor function--and opens up a whole new universe of how we might intervene. "

(48) An increasing body of evidence has suggested that participating in mentally stimulating activity, socializing frequently and exercising may help protect against age-related decline-at least cognitive decline. As early as 1995, neuroscientist Carl Cotman, who studies aging and dementia at the University of California at Irvine, published a paper in Nature showing that physical exercise produces a protein that helps keep neurons from dying and spurs the formation of new neural connections in the brain. (49) More recently, Cotman demonstrated in studies of elderly dogs and mice that enriching their social environment is associated with improvement in brain function.

Researchers are also finding that social activity may be linked to the same protective effect in people. A recent study of 2 500 adults ages 70 to 79, published in the journal Neurology, found that those who were able to stay mentally sharp were also those who exercised once a week or more, had at least a ninth grade literacy level and were socially active.

While further research needs to be done to establish the exact impact of social activity and exercise on specific age-related declines (50) it’s likely that a reduction in social activity may simply be a symptom of physical decline, since people may naturally withdraw from social engagement as they lose motor skills-most researchers would agree that it is not unreasonable to encourage seniors to get out there more. Only 10% of people over 65 get the recommended amount of exercise (at least 2. 5 to 5 hours a week), and given that seniors already tend to be more socially isolated than younger adults, it’s difficult to motivate them to become more active. "If you are alone, you are less likely to follow recommendations," notes Verghese. It might help, though, if you visit Grandma more often and let her know that a regular pastime may just help her stay fitter and sharper longer.

(50) it’s likely that a reduction in social activity may simply be a symptom of physical decline, since people may naturally withdraw from social engagement as they lose motor skills

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