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Although he failed this time, he didn't give up and ____ studying hard.
11个月前
12个月前
观察下列等式: 可以推测,(x²+x+1)5展开式中,第五、六、七项的系数和是( )。
1年前
By 16:30, _____________ was almost closing time, nearly all the paintings had been sold.
1年前
闭合开关S后,小磁针静止时北极的指向如图所示,则螺线管左端是______极(选填“N”或“S”),电源左端是______极(选填“正”或“负”).
1年前