某热水供暖系统,在蒸汽锅炉房内设壳管式汽水换热器和凝结水汽水换热器,加热网路循环水。

题型:单项选择题

问题:

某热水供暖系统,在蒸汽锅炉房内设壳管式汽水换热器和凝结水汽水换热器,加热网路循环水。总热负荷为520×104kJ/h,饱和蒸汽压力为7×105Pa,设凝结水流出凝结水换热器的水温t=80℃,取换热器效率为965,则蒸汽的流量为()kg/h。

A.2231

B.2568

C.2903

D.3000

考点:注册公用设备工程师暖通空调专业案例勘察设计注册公用设备工程师暖通空调专业案例
题型:单项选择题

In the 1960s, medical researchers Thomas Holmes and Richard Rahe developed a checklist of stressful events. They appreciated the tricky point that any major change can be stressful. Negative events like "serious illness of a family member" were high on the list, but so were some positive life-changing events, like marriage. When you take the Holmes-Rahe test you must remember that the score does not reflect how you deal with stress—it only shows how much you have to deal with. And we now know that the way you handle these events dramatically affects your chances of staying healthy.

By the early 1970s, hundreds of similar studies had followed Holmes and Rahe. And millions of Americans who work and live under stress worried over the reports. Somehow, the research got boiled down to a memorable message. Women’s magazines ran headlines like "Stress causes illness. " If you want to stay physically and mentally healthy, the articles said, avoid stressful events.

But such simplistic advice is impossible to follow. Even if stressful events are dangerous, many—like the death of a loved one—are impossible to avoid. Moreover, any warning to avoid all stressful events is a prescription (处方)for staying away from opportunities as well as trouble. Since any change can be stressful, a person who wanted to be completely free of stress would never marry, have a child, take a new job or move.

The notion that all stress makes you sick also ignores a lot of what we know about people. It assumes we’re all vulnerable (脆弱的) and passive in the face of adversity (逆境). But what about human initiative and creativity Many come through periods of stress with more physical and mental vigor than they had before. We also know that a long time without change or challenge can lead to boredom, and physical and mental strain.

The result of Holmes-Rahe’s medical research tells us ().

A. the way you handle major events may cause stress

B. what should be done to avoid stress

C. what kind of event would cause stress

D. how to cope with sudden changes in life

题型:单项选择题

决定内在不经济的主要因素有( )。

A.企业管理机构庞杂,管理效率低下

B.生产规模过大产生对生产要素的过度需求

C.生产规模过小产生埘生产要素的过度需求

D.销售费用的增加

E.刺激要素价格上涨导致生产成本增加

题型:单项选择题

医患关系模式

题型:单项选择题

劳动教养行政复议的申请期限是自知道劳动教养决定之日起()内。

A.30日 

B.60日 

C.90日 

D.180日

题型:单项选择题

脑囊虫病患者,颅腔MRI示脑室内有占位性病变,临床反复出现突发性体位性剧烈头痛及呕吐等颅内压增高症状,对该患者的治疗应用哪一种方案()

A.小剂量阿苯达唑治疗

B.大剂量吡喹酮治疗

C.甘露醇加地塞米松脱水治疗

D.脑室—腹腔引流术

E.颅腔手术摘除脑室内病变

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