搜题请搜索小程序“爱下问搜题”
问题 单项选择题 共用题干题

患者男性，25岁。因十二指肠溃疡急性穿孔后进行彻底的溃疡手术，术后出现尿潴留。

该药的作用机制是（）

A.抑制胆碱酯酶

B.激动M受体

C.阻断M受体

D.激动β受体

E.激动α受体

答案

参考答案：C

填空题

一人用100N的力沿水平方向推着一个木箱在水平地板上匀速前进时，箱重250N，则木箱受到的摩擦力是______N，如果人所用力变为120N后，则木箱所受摩擦力是______N．
查看答案
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. \

Who are the least physically active according to the study

A. Men with sedentary jobs.
B. Men with active jobs.
C. Healthy women with no jobs.
D. Healthy men with no jobs.
查看答案