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【单选题】
用离心通风机将5000kg/h空气输入加热器中,由20°C加热至140°C。对于该风机安装于加热器前后的两种情况,有( )。
A.
需要输送的流量不变,但需要的全风压要变
B.
需要的风压不变,但需要的流量要变
C.
需要输送的流量和需要的全风压都要变
D.
需要输送的流量和需要的全风压都不变
参考答案：
参考解析：
刷刷题刷刷变学霸
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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