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【多选题】
属于阳离子型表面活性剂是A.
烷基苯磺酸钠
B.
十八烷基二甲基苄基氯化铵
C.
脂肪醇羧酸盐
D.
2-烷基咪唑啉季铵盐
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【简答题】He gains great __________ (满意) from palying tennis.
【单选题】The interest rate on a variable - rate mortgage can only rise - it cannot fall.
A.
True
B.
False
【简答题】NASA Since 1958, NASA has made a number of great gains in science and technology. It is the leader in aerospace research. It has provided us with new ways to view Earth and space. In 1961, President K...
【简答题】车轴裂纹,当裂纹与车轴中心线夹角大于45°时称为( )。
【单选题】The young man is a person of great perseverance(毅力), from which he ______ a lot.
A.
satisfies
B.
gains
C.
awards
D.
benefits
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