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【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
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【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
do not use naturally produced fertilisers
B.
produce carbon dioxide when removing weeds
C.
use high doses of weed-killer
D.
use too many resources to qualify for organic status
【多选题】发电厂回热循环的优点有( )
A.
提高发电厂热效率
B.
减小汽轮机低压缸尺寸，使发电厂的末级叶片变短。
C.
减小凝汽器尺寸，减小锅炉受热面。
D.
可兼作除氧器。
【单选题】（）制冷系统采用回热循环可以提高制冷系数。
A.
R717
B.
R12
C.
R22
D.
B十C
【单选题】回热循环的目的是提高（）。
A.
循环热效率
B.
汽压
C.
温度
D.
工质体积
【单选题】Most shoppers know the feeling. You stand in front of piles of organic produce and wonder what those premium prices are buying you over and above what you get from standard foods. Not a lot nutrition-...
A.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
【单选题】与无过热的基本循环相比,有效过热循环的制冷系数()
A.
增大
B.
减小
C.
增大或减小与制冷剂的种类有关
D.
都不对
【多选题】⾼压加热器分为()
A.
混合式
B.
表⾯式
C.
对流式
D.
逆流式
【单选题】NCC320柜配有（）个230VAC，250W的加热器。
A.
1；
B.
2；
C.
3；
D.
4
【判断题】回热循环总是可以提高循环的效率。()
A.
正确
B.
错误
【单选题】回热循环燃气轮机压比越高，热效率及出功越高（ ）
A.
对
B.
错
【判断题】回热循环和再热循环都能提高循环热效率。
A.
正确
B.
错误
【单选题】在制冷系统中，有过热循环的产生，就会使（）
A.
吸气比容增大
B.
吸气比容减小
C.
吸气压力降低
D.
吸气压力升高
【判断题】采用中间再热循环的目的是降低末几级蒸汽湿度和提高循环的热效率。
A.
正确
B.
错误