具有 Krafft 点的表面活性剂是
A. 聚山梨酯类
B. 脂肪酸山梨坦类
C. 肥皂类
D. 聚氧乙烯脂肪酸酯
表面活性剂的增溶作用,是由于形成了
A. 络合物
B. 胶束
C. 包合物
D. 复盐
I won’t call you, ________ something unexpected happens.
A. unless
B. whether
C. because
D. while
_______ he had not hurt his leg, John would have won the race.
A. If
B. Since
C. Though
D. When