下载APP
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
【多选题】( )是气关阀的结构特点。
A.
(A)阀杆是空心的
B.
(B)靠气源压力关闭
C.
(C)靠流体压力打开
D.
(D)阀杆是实心的
【判断题】尿素蒸发加热器蒸汽进口调节阀应采用气关阀。
A.
正确
B.
错误
【单选题】GT-004进汽调节阀有（）个。
A.
4
B.
6
C.
8
【判断题】常开控制阀（气关阀）在没有控制信号时，阀处于全开状态（ ）
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.
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】调节阀按其结构可分为（）。
A.
单芯阀和双芯阀
B.
风关阀和风开阀
C.
单芯阀和风开阀
D.
双芯阀和风关阀
【单选题】冷凝器直动式水量调节阀的特点是：（）.
A.
口径较大
B.
灵敏性较差
C.
启阀力较大
D.
控制精度差
【判断题】气开阀指阀的开度随气压的增大而增大;气关阀指阀的开度随气压的增大而减小。
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
【判断题】调节阀实际可调比取决于调节阀的阀芯结构。
A.
正确
B.
错误
【判断题】调节阀的正作用就是气关阀，反作用就是气开阀。
A.
正确
B.
错误
【多选题】轻油进料调节阀的定位器失灵，应（）
A.
改副线控制
B.
用上游阀控制
C.
参考原来的原料油流量操作
D.
参考原来的原料油压力操作