题目

现有三组溶液：①汽油和氯化钠溶液  ②39％的乙醇溶液  ③氯化钠和单质溴的水溶液，分离以上各混合液的正确方法依次是                                      A . 分液、萃取、蒸馏                       B.  萃取、蒸馏、分液 C . 分液、蒸馏、萃取                       D.  蒸馏、萃取、分液China’s maternal and infant goods ecommerce platforms ________ heavily and speeding up their steps to expand offline channels.A.investB.are investingC.are investedD.have invested