问题 单项选择题

已知某房间全热冷负荷为Q=60kW,室内空气的焓值in=49kJ/kg,室外空气的焓值iW=85kJ/kg,送风状态空气的焓值i0=34kJ/kg,新风比为m=18%,当采用最大温差送风时,则处理空气所需的冷量为()。

A.45kW

B.120.8kW

C.170.6kW

D.180kW

答案

参考答案:C

解析:

室内冷负荷:

Q1=G×(1-m)×(in-i0)=4×(1-0.18)×(49-34)kW=49.2kW

新风冷负荷:

Q2=Gw(1-m)(iw-in)=4×(1-0.18)×(86-49)kW=121.4kW

冷量:Q=Q1+Q2=(49.2+121.4)kW=170.6kW

阅读理解

Of course you don’t want to be sick in your vacation. So what can you do while traveling? There are three things you should remember: relax, sleep and eat well.

A vacation is a time for relaxing, but very often it is not. Think about what you do when you are a tourist. There are so many places to visit: shop, parks, churches and temples ( 寺庙). You may spend most of the days walking around these places. This can be very tiring. Do not ask your body to do too much. A tired body means a weak body. A weak body gets dick easily. So sit down for a few hours in a nice place. In good weather, look for a quiet park bench.

Sleep is also important. If you want to stay healthy, you need to get enough sleep. Your hotel room may be noisy, or the bed may be too hard. Or you may want to stay out late at night. Then you should plan to sleep for an hour during the day. The extra  hour can make a big difference.

Finally, if you want to stay healthy, you must eat well. That means eating the right kinds of food. Your boday needs fresh fruit, vegetables, mean, milk and cheese.

So, remember this: if you want to enjoy your vacation, take good care of yourself. Give your body some rest. Get enough sleep and eat healthy food.

小题1:You should ____ while traveling.

A.eat well

B.walk all the time

C.do shopping

D.ask your body to do a lot.小题2:Traveling is usually ____.

A.easy

B.noisy

C.tiring

D.dangerous小题3:You must ___ to enjoy your traveling.

A.visit parks

B.stay healthy

C.go to churches and temples

D.sit down for a few hours小题4:The underlined word “ extra” means ___ here.

A.one more

B.more than one

C.usual

D.different小题5: The text tells us ____- in traveling.

A.how to rest

B.what places to visit

C.how to relax and sleep

D.how to take good care of ourselves

问答题 简答题