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刷刷题刷刷变学霸
举一反三
【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】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.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
相关题目：
【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】轴封加热器为（）加热器。
A.
表面式
B.
回热式
C.
混合式
【单选题】利用局部加热使联接处的金属熔化，再加入填充金属，凝固后彼此牢固结合的方法叫（）。
A.
熔化焊
B.
压力焊
C.
钎焊
D.
锻焊
【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.
they are approved by many experts
B.
C. they won’t cause diseases
C.
B. they taste better than standard foods
D.
they are free from pesticides
【单选题】下列不是硝镁加热器泄漏现象的是（）。
A.
加热器气液相温差增加
B.
塔中、塔顶温度增高
C.
浓硝冷凝器泄漏
D.
成品酸浓度下降
【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
【单选题】NCC320柜配有（）个230VAC，250W的加热器。
A.
1；
B.
2；
C.
3；
D.
4
【单选题】熔焊是利用局部加热使连接处的母材金属熔化,再加入(或不加入)填充金属形成( )而结合的方法。
A.
融合
B.
焊缝
C.
焊接
D.
一体
【单选题】熔焊是利用局部加热使连接处的母材( ),再加入(或不加入)填充金属形成焊缝而结合的方法。
A.
金属熔化
B.
金属结合
C.
温度升高
D.
金属成型
【单选题】下列使加热器端差减小的是（）。
A.
疏水水位过高；
B.
受热面结垢；
C.
传热系数增大；
D.
抽汽压力增加。