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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】下面列管式换热器中，壳程不可以清洗的是（）。
A.
浮头式换热器
B.
U形管式换热器
C.
固定管板式换热器
D.
填料函式换热器
相关题目：
【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】下面列管式换热器中，壳程不可以清洗的是（）。
A.
浮头式换热器
B.
U形管式换热器
C.
固定管板式换热器
D.
填料函式换热器
参考解析：
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