问题
单项选择题 A1型题
下列关于表面活性剂的叙述,正确的是()
A.能显著增加两相间表面张力(或界面张力)
B.分子结构中主要含亲水基团
C.分子结构中主要含疏水基团
D.分子结构中同时含有亲水基团和疏水基团
E.高浓度时主要在溶液表面定向排列
答案
参考答案:D
下列关于表面活性剂的叙述,正确的是()
A.能显著增加两相间表面张力(或界面张力)
B.分子结构中主要含亲水基团
C.分子结构中主要含疏水基团
D.分子结构中同时含有亲水基团和疏水基团
E.高浓度时主要在溶液表面定向排列
参考答案:D
词语填空 用所给单词的适当形式填空.
do not like to __4__ too close to one another __5__ there is a reason. It could be very interesting to __6__ an Arab and an Englishman talking together. The Arab __7__ is friendly will stand close to his friend, but the Englishman will move back in __8__ to keep a certain distance __9__.When they finish their talk, the two may be quite a distance away from the place __10__ they were standing. |