题目正常牛乳20℃时的密度为( )。A. 1.025~1.027;B. 1.028~1.032;C. 1.035~1.038;D. 0.028~0.032;正常牛乳20℃时的密度为( )。A. 1.025~1.027;B. 1.028~1.032;C. 1.035~1.038;D. 0.028~0.032;题目解答答案A. 1.025~1.027;