引起高分子溶液稳定性降低的方法有()
A.加入少量电解质
B.加入大量电解质
C.加入脱水剂
D.加入带相反电荷的胶体
E.调节pH
参考答案:B, C, D, E
—How do you find your new classmates?
—Most of them are kind, but ____ is so good to me as Bruce.
A.none
B.no one
C.every one
D.some one