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问题 单项选择题

多层住宅基本平面类型中，集中式的特点是（）

A.单元四面临空，每户皆可采光、通风、分户灵活，每户有可能获得两个朝向而有转角通风

B.两侧布置各户，楼梯服务户数多，使用率大大提高，且节约用地

C.便于各户并列组合，一梯可服务多户，每户有良好的朝向、采光和通风条件

D.每套有两个朝向，便于组织通风，套间干扰少，较宜组织户内交通

答案

参考答案：A

解析：多层住宅基本平面类型中，集中式的特点包括：数户围绕一个楼梯布置，单元四面临空，每户皆可采光、通风，分户灵活，每户有可能获得两个朝向而有转角通风；外形处理也较为自由，可丰富建筑群的艺术效果；建筑占地少，便于在小块用地上插建。但节能、经济性比条式住宅差。

单项选择题

关于红细胞增多症的描述不正确的是()

A．原发性真性红细胞增多症主要见于骨髓增殖性疾病

B．原发性真性红细胞增多症的特点为红细胞持续性显著增多

C．原发性真性红细胞增多症的白细胞和血小板数量无明显变化

D．原发性真性红细胞增多症全身总血容量增加

E．继发性红细胞增多症多因缺氧红细胞生成素代偿性增加所致
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单项选择题

Who says your job leaves you no time to hit the gym A detailed new study of U. S. physical activity patterns shows that men who work full-time—whether their jobs are active or sedentary— end up getting more exercise than healthy working-age men without a job.
The new study comes from researchers at the National Institutes of Health (NIH). As part of the National Health and Nutrition Examination Survey in 2003, some 1,800 working-age adults were asked questions about their lifestyle and work habits, and, most importantly, they then agreed to wear an accelerometer—a device to measure their physical activity—over the course of several days.
Those data from the accelerometers provide a rare opportunity to nail down how much activity the typical American actually does.
They show that men or women who work in active jobs do more physical activity on weekdays than men or women working in sedentary jobs: that’s perhaps not surprising, but the NIH researchers suggest that it still matters because of an ongoing shift in the economy toward sedentary work.
The more surprising finding is the one that compares full-time workers to people who don’t work. The study shows that men with full-time jobs do more physical activity than healthy men without jobs. ("Healthy men", in this case, were those men who said their primary reason for being out of work—was something other than health or disability.) In fact, even sedentary full- time workers performed more weekday physical activity overall than the healthy non-workers.
The results looked very different for women. Women in sedentary jobs did less physical activity on weekdays than their healthy non-working peers.
So what drives the gender (性别) difference The study looks at the pattems, and unfortunately can’t provide too much detail about their causes. There could be many possible answers, including, perhaps, different abilities to pay for leisure time activities or different attitudes about work and physical activity. It could also be that more non-working women than men are choosing to be at home running around full-time after the kids.
But the NHK researchers do find evidence, they write, to suggest that, whatever causes the difference, healthy non-working women "are replacing work with active pursuits whereas" —for some reason— "non-working men generally are not. \

What is a possible reason for non-working women to be

A. They are well-educated.
B. Their kids keep them busy.
C. They are-open-minded.
D. Their husbands influence them.
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