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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
【判断题】在精馏塔内任意1块理论板，其气相大于液相的泡点。( )
A.
正确
B.
错误
【判断题】冷却剂必须具备大量吸收中子的特点。()
A.
正确
B.
错误
【判断题】精馏塔操作压力的变化，对分离组分间的相对挥发度没有影响。()
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
【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】下列冷却剂中冷却能力最大的是()。
A.
20℃自来水
B.
20℃的10%盐水溶液
C.
矿物油
D.
盐
【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】某厂精馏塔进料量为50m3／h，进料管的管内径为100mm，则进料流速为()。
A.
0.0177m/s
B.
0.5m/s
C.
1.77m/s
D.
109m/s
【单选题】下列不属于作为冷却剂的液态金属应满足的条件（）
A.
熔点低
B.
溶于合金
C.
蒸气压低
D.
价格便宜
【单选题】下列不属于乙烯精馏塔中沸器作用的是（）。
A.
使塔的温度分布合理
B.
降低釜温
C.
使塔内汽液相负荷分布均匀
D.
节省热源
【单选题】下列滴丸冷却剂具备的条件不包括
A.
不与主药发生作用
B.
对人体无害、不影响疗效
C.
有适宜的粘度
D.
脂溶性强
E.
有适宜的相对密度
【单选题】用PEG6000作基质制备的滴丸中，选用冷却剂为：（）
A.
液状石蜡
B.
水或乙醇
C.
二者均可
D.
二者均不可
【单选题】转炉炉容比比较大时，有利于采用（）作冷却剂。
A.
废钢
B.
铁块
C.
铁矿石
D.
废钢和铁块
【单选题】自动汽化冷却法的冷却剂是（）。
A.
水
B.
空气
C.
冰
D.
冷冻盐水