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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
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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】二甲苯的透明指数是（）
A.
1.70
B.
1.20
C.
1.50
D.
1.0
E.
2.0
【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】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
【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】二甲苯的闪点（）℃。
A.
18
B.
20
C.
24
D.
30
【单选题】邻二甲苯开口闪点为()℃。
A.
15
B.
16
C.
17
D.
18
【判断题】双层瓶外瓶中装的是二甲苯。
A.
正确
B.
错误
【判断题】三苯指的是苯、甲苯、二甲苯。
A.
正确
B.
错误
【单选题】二甲苯有()种易构件。
A.
1
B.
2
C.
3
【单选题】加热器出现负端差，则（ ）。
A.
表明该加热器一定装有蒸汽冷却器（段）
B.
表明该加热器运行出现故障
C.
表明该加热器一定装有疏水冷却器
D.
是不可能的
【判断题】二甲苯极易燃烧，且蒸气有毒。
A.
正确
B.
错误
【单选题】二甲苯有()种异构体。
A.
一种
B.
两种
C.
三种