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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】发热元件应该采取的安装方式为()?
A.
贴板安装
B.
悬空安装
C.
嵌入式安装
D.
限制高度安装
【单选题】金属电热元件材料不包括()。
A.
镍铬合金
B.
锰
C.
钼
【单选题】（）制成的电热元件的最高使用温度可达3600℃.
A.
铁铬铝
B.
铬镍
C.
二硅化钼
D.
石墨
【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
【判断题】电开水器内的 电加热元件更新周期为E2。
A.
正确
B.
错误
【判断题】热继电器的发热元件接在主电路中，触点接在控制电路中。
A.
正确
B.
错误
【判断题】变压器发热元件温度不得超过95℃。
A.
正确
B.
错误
【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】使用喷雾仪时，最低水位线应()电热元件。
A.
低于
B.
水平于
C.
接近
D.
高于
【单选题】过热继电器发热元件的电流是三相异步电机的-------（ ）。
A.
相电流
B.
线电流
C.
直流电流
D.
脉动电流
【单选题】热继电器的热元件应串接在（）中。
A.
主回路中
B.
控制回路的起动，停止按钮之间
C.
控制回路中接触器线圈的后边
D.
控制回路中的起动按钮前面
【单选题】热继电器的热元件应( )在主回路中
A.
并联
B.
串联
C.
混联
D.
都不可以
【判断题】空气预热器装有吹灰装置，用于去除空气预热器中受热元件的积灰或灰垢。
A.
正确
B.
错误