题目

Most of the representatives raised a question at yesterday’s meeting,_____ needs______ urgently． A．that; to be solved                                        B．the one that; solved C．one which; solving                                    D．what; solving 答案：C9．mgH2O中含有1mol电子，则m的值为（　　）A．18gB．1.8gC．6gD．0.6g