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【判断题】

回热抽汽管道上设置止回阀的作用是加热器切除时防止蒸汽进入加热器。

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】截门式止回阀的特点是()。

A.
结构简单;
B.
阀芯容易被卡住;
C.
密封性能好;
D.
安装维修方便。

【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