压力开关209的动作压差是190～230kpa。

某养鸡户一群产蛋鸡，晚间一切正常，次日发病，病鸡主要表现精神沉郁，羽毛松乱，不愿走动，常有腹泻，排出黄色、灰白色的稀粪。体温升高到43～44℃，减食或不食，渴欲增加，呼吸困难，口、鼻分泌物增加，鸡冠和肉髯变青紫色，有热痛感，产蛋停止。腹膜、皮下组织及腹部脂肪常见小点出血。心包变厚，心包内积有多量不透明、淡黄色液体，有的含纤维素絮状液体，心外膜、心冠脂肪出血尤为明显。取病鸡血涂片，肝脾触片经美蓝、瑞氏或姬姆萨染色，如见到大量两极浓染的短小杆菌。该病病原可能是（）

A.葡萄球菌

B.大肠杆菌

C.沙门氏菌

D.多杀性巴氏杆菌

E.链球菌

下列各项不是胎儿生长受限的中医证型是

A．肾气亏虚

B．阴虚内热

C．气血虚弱

D．脾虚湿盛

E．胞宫虚寒

抽子的种类有无阀抽子、（）、水力式抽子。

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. \

A sedentary job (Para. 1) is one that involves ______.

A. staying seated a lot
B. intensive concentration
C. moving about a lot
D. superb skills

DME系统的工作容量为：（）.

A.50架飞机

B.70架飞机

C.85架飞机

D.100架飞机