题目

--- If you have any trouble, be sure to call me. ---- _______. A. I am sorry to hear that      B. I will. Thank you very much  C. I have no trouble          D. I will think it over 答案：B如图是电解CuCl2溶液的装置，其中c、d为石墨电极，则下列有关判断正确的是( )A. a为负极，b为正极B. a为阳极，b为阴极C. 电解过程中，d电极质量增加D. 电解过程中，氯离子浓度不变