食品物料蒸发浓缩的特点为()、()、()、()、()和()。
参考答案:热敏性;腐蚀性;粘稠性;结构性;褐变性;易挥发组分
He turned ________ ten years ago but later he became ________. [ ]
A. a teacher; a doctor
B. teacher; doctor
C. teacher; a doctor
D. a teacher; doctor
下列离子组能在酸性溶液中大量共存的是
A.K+、Mg2+、Cl-、SO32-
B.Cu2+、K+、Cl-、SO42-
C.NH4+、Na+、CO32-、OH-
D.Ca2+、HSO3-、K+、SO42-