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【单选题】
空浴式燃料气加热器是通过（）的原理，通过空气加热燃料气。
A.
间接加热
B.
直接加热
C.
混合式加热
D.
燃烧式加热
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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
【单选题】乙硫醇具有极难闻的气味，常作为无气味燃料气漏气的警报。下列化合物中属于乙硫醇结构的是（）
A.
CH3CH2SH
B.
CH3CH2OH
C.
HOCH2CH2OH
D.
HSCH2CH2OH