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【单选题】
灰斗气化风机停运时，要待电加热器出口温度降到（）℃，按下灰斗气化风机电源抽屉开关上“停止”按钮，气化风机停运。
A.
40
B.
60
C.
80
D.
90
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参考答案：
参考解析：
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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