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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】图中，两电极上发生的电极反应为：a极：Cu2++2e-=Cub极：Fe-2e-=Fe2+，下列说法中不正确的是（ ）
A.
该装置可能是电解池
B.
a极上发生的是还原反应
C.
a、b可能是同种电极材料
D.
该装置在工作时，溶液中的阳离子可能向b极移动