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【判断题】

高压和低压加热器在运行中要保持一定水位原因是提高机组效率。()

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

【多选题】高、低压加热器装空气管的作用是()

A.
提高凝汽器真空
B.
抽走聚集在管束表面的空气
C.
提高加热器的传热效果
D.
防止加热器钢管泄漏

【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