题目

要配制0.300 moL/L的稀H2SO4 500 mL，若使用18.4 mol/L的浓H2SO4来配制时，所需浓硫酸的体积V为____ mL。（三位有效数字） 答案：8.15ml -Tom, why did you make no reply to me when I called your name in the street just now?   -Sorry, Jim, I_______ to my wife on the phone.       A. talked             B. was talking    C. am talking      D. had talked