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举一反三
【单选题】下列关于强、弱电解的说法中正确的是（ ）
A.
强酸、强碱及大部分盐类属于强电解质，弱酸弱碱属于弱电解质
B.
所有的离子化合物都是强电解质，所有的共价化合物都是弱电解质
C.
强电解质溶液的导电能力一定比弱电解质溶液的导电能力强
D.
CO 2 的水溶液能导电，本身又是化合物，所以它是电解质
【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food．Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...
A.
They overlook the risks of the food they eat.
B.
They overestimate the hazards of their food.
C.
They are overoptimistic about the safety of their food.
D.
They overstate the government's interference with the food industry.
【单选题】用铂电极电解CuSO4溶液，当铜离子浓度降至一半时，停止通电，若使CuSO4溶液恢复原浓度、原体积，应加入的适当物质是[ ]
A.
CuSO4
B.
CuSO4·5H2O
C.
CuO
D.
Cu(OH)2