题目内容

24．把两种电性相反的溶胶混合，要使溶胶完全凝聚的条件是( )

A. 两种溶液离子数目相等
B. 两种溶胶粒子所带的总电量相等
C. 两种溶胶粒子数和电荷数必须相等
D. 一种溶胶粒子为另一种溶胶粒子数目的倍数
E. 以上答案都不是

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25．对胶体具有保护作用的是（）

A. 蔗糖
B. 明胶
C. 氨水
D. 生理盐水
E. 硫酸钾

26．下列不能使溶胶聚沉的方法为 ( )

A. 加入电解质
B. 加入带相反电荷的胶体
C. 加热
D. 加入溶剂

1.— I called you at 4:00 yesterday afternoon, but no one answered. — Sorry, I _____ with my friends at that time.

A. swim
B. swam
C. will swim
D. was swimming

2.— Excuse me, where is Mr. Brown's office?— Sorry, I don't know. I _____ here for only a few days.

A. work
B. worked
C. have worked
D. will work