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举一反三
【多选题】关于表面活性剂下列说法正确的是( )
A.
疏水基的支链化对去污性能有显著影响 , 一般随着支链化程度的提高，去污能力明显下降，但可以提高表面活性剂的润湿能力。
B.
洗涤剂中要求表面活性剂的亲油基和亲水基要保持相对平衡。
C.
一般来说，表面活性剂的碳链越长，洗后织物的手感越好。
D.
在洗涤剂配方中多采用阴离子表面活性剂和非离子表面活性剂。
【单选题】He ’ s always had a for books. If he would work in a library, it would be a dream come true.
A.
pain
B.
dislike
C.
passion
D.
passionate
【多选题】下列关于表面活性剂的说法正确的是
A.
表面活性剂的分子量一般低于30
B.
表面活性剂具有双亲性分子
C.
亲水侧为非极性烃链
D.
亲油侧为非极性烃链
E.
亲水侧可以是硫酸及其盐
【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
【简答题】And not to say he would have imagined ( 9 ) Mount Kilimanjaro.
【简答题】Mom was aware of the 18 I was having with accepting this change. She wrapped her arms around me, 19 me as tears trickled down my cheeks. At last she learned back and smiled at me."I know this is 20 fo...
【单选题】A teenage girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
A.
a little
B.
a few
C.
much
D.
more
【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
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