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【单选题】

下列哪项不属于光管式加热器的特点()

A.
表面光滑
B.
金属消耗多
C.
加热面积小
D.
传热面积大
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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

【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