搜题请搜索小程序“爱下问搜题”
问题 问答题 简答题

采暖居住房间的密闭程度（气密化程度）对卫生保健、经济、能源消费等方面，各有什么影响？。

答案

参考答案：

就保温而言，房间的密闭性越好，则热损失越少，从而可以在节约能源的基础上保持室温。但从卫生要求来看，房间必须要有一定的换气量。另一方面，过分密闭会妨碍湿气的排除，使室内湿度升高，从而容易造成表面结露和围护结构内部受潮

选择题

水面漂浮着甲、乙两个实心球（m甲＞m乙），若甲和乙露出水面的体积相等，则（　　）

A．甲球的密度大于乙球的密度

B．甲球的密度等于乙球的密度

C．甲球的密度小于乙球的密度

D．无法比较两球密度的大小
查看答案
阅读理解
任务型阅读。

     The World Bank,the United Nations and the London School Of Hygiene and Tropica1 Medicine did a study
to urge hand-washing around the world. They found that one million lives could be saved each year if people
washed their hands with soap often. They said that programs to increase hand-washing with soap could be
among the most effective ways to reduce infectious disease.
      Doctors say,many diseases can be prevented from spreading by hand-washing. These include pinworms
(寄生虫),influenza (流行性感冒),the common cold,hepatitis (肝炎) A,meningitis ( 脑膜炎) and infectious
diarrhea.  (腹泻)
     Hand--washing destroys germs from other people,animals or objects a person has touched. When people
get bacteria on their hands,they can infect themselves by touching their eyes,nose or mouth. Then these people
can infect other people.
     The experts say the easiest way to catch a cold is to touch your nose or eyes after someone nearby has
sneezed or coughed.Another way to become sick is to eat food prepared by someone whose hands were not
clean. The experts say that hand--washing is especially important before and after preparing food,before eating
and after using the toilet. People should wash their hands after handling animals or animal waste,and after
cleaning a baby.
     The experts say it is also a good idea to wash your hands after handling money and after sneezing or
coughing. And it is important to wash your hands often when someone in your home is sick. The experts say
the most effective way to wash your hands is to rub them together while using soap and warm water.They say
you do not have to use special antibacterial soap. Be sure to rub all areas of the hands for about ten to fifteen
seconds. The rubbing action helps remove germs. Then rinse (冲洗) the hands with water and dry them.

                                                                   Title:  1   
Theme Hand-washing could be among the most effective ways to reduce infectious
diseases.
Many   2  can be preventedPinworms, influenza, the common cold hepatitis A, meningitis and infectious
diarrhea.
  3  to do hand-washing 1. Before and after   4   food
2. Before eating and after using the    5   
3. After handling animals or animal waste;
4. After cleaning a baby;
5. After handling money and after sneezing or  6    ;
6. when someone in your home is sick.
   7    to do hand-washing Rubbing them together while using   8   and warm water, rubbing all areas of the hands for about 10~15 seconds and  9    the hands with water and dry them.
How hand- washing works Hand-washing destroys germs from other people,   10    or objects a person has touched.
查看答案