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To improve the quality of our products, we asked for suggestions______ had used the products. [ ]
1年前
四边形ABCD中,(向量)AB=a,BC=b,CD=c,DA=d,ab=bc=cd=da,问该四边形是什么图形?
1年前
Many people believe that 3G mobile phones will be used in almost all everyday activities.
1年前
After John had been in London for three years, he and his wife had a lot to tell ________.
1年前
1年前