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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：
【判断题】锅炉严重缺水时，则应立即上水，尽快恢复正常水位。
A.
正确
B.
错误
【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
【判断题】锅炉严重缺水时，则应立即上水，尽快恢复正常水位。
A.
正确
B.
错误
【单选题】管加热器的作用是（）。
A.
消除多余的双氧水
B.
高温杀菌
C.
加热产品进行消毒
D.
保证正压
【单选题】低于正常水位5米记作﹣5米，高于正常水位8米记作（）。
A.
﹣8米
B.
3米
C.
+13米
D.
+8米
【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】低于正常水位0.16米记为-0.16,高于正常水位0.02米记作( )。
A.
+0.18
B.
+0.02
C.
－0.02
【单选题】锅炉连续排污取样水管一般安装在汽包正常水位下（）。
A.
100-200mm
B.
200-300mm
C.
300mm以下
D.
50-100mm
【单选题】蒸汽锅炉排污前，要将水位调至（）正常水位。
A.
稍高于
B.
低于
C.
稍低于
D.
等于
【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】高压加热器正常水位高三值（ ）mm
A.
38
B.
58
C.
88
D.
138
【判断题】锅炉汽包正常水位±50mm
A.
正确
B.
错误
【单选题】阀冷却系统水位应正常，水位过低需补充（）
A.
液压油
B.
油
C.
水
D.
冷却水
【单选题】锅炉连续排污取样水管一般安装在汽包正常水位下（）。
A.
100～200mm
B.
200～300mm
C.
300mm以下
D.
50～100mm处
【单选题】锅炉运行时正常水位的波动范围应在中水位线的（）。
A.
±10mm；
B.
+25mm；
C.
-25mm；
D.
±25mm