题目

Do you expect_______ to be a possibility that more and more students from poor families will be able to go to college?    A．this                    B．that                         C．it                            D．which 答案：C设nA为阿伏加德罗常数的数值．下列说法错误的是（　　）A．1molNH3中含有3nA个N-H键B．在铜与硫的反应中，1mol铜失去的电子数为2nAC．标准状况下，11.2LCO2中含有nA个O原子D．20g重水（1H2O）中含有10nA个电子