造成下列乳剂不稳定现象的原因是:转相()。
A.Zeta电位降低
B.分散相与连续相存在密度差
C.微生物及光、热、空气等的作用
D.乳化剂失去乳化作用
E.乳化剂类型改变
参考答案:E
A.50m
B.60m
C.48m
D.192m
Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.
A.who
B.which
C.when
D.that