下列关于表面活性剂结构特征的叙述中正确的是()
A.有亲水基团,无疏水基团
B.有疏水基团,无亲水基团
C.有中等极性基团
D.无极性基团
参考答案:C
—Can you tell me how to make apple juice?
—Sure. Please watch carefully and you will see how it .
A.is made
B.is making
C.makes
D.will make
老年性痴呆的记忆训练中,数字记忆广度训练属于()
A.瞬时记忆训练
B.短时记忆训练
C.长时记忆训练
D.无错误学习技术
E.取消提示技术