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【单选题】
2 下列的英文缩写和中文名字的对照中,错误的是 ___ _ ___ 。A.
CAD-- 计算机辅助设计
B.
CAM-- 计算机辅助制造
C.
CIMS-- 计算机集成管理系统
D.
CAI-- 计算机辅助教育
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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
【单选题】When Watson enrolled at Brown University in 2009, she couldn’t decide whether to quit acting and go back to campus life temporarily.
A.
T
B.
F
C.
NG
【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.
【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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