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【单选题】

加热器分为直接加热与间接加热,间接加热是用热产品加热冷产品

A.
正确
B.
错误
举报
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】间接加热系统的优点是()。

A.
系统占地面积小
B.
系统简单
C.
造价较高
D.
适应管道输量大幅变化

【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