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It’s said that the president’s absence has _______ wide concerns and guesses.
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_______ his father_______ his mother are a teacher. They are in the same school.
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There is some _____________ under the tree. [ ]
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印度民族大起义杰出的女英雄是圣马丁。 错误:________;改正:________
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证明:函数f(x)=(根号下1+x的平方)-x在R上是单调减函数.用导数法和定义法分别证明
1年前