Peter speaks Chinese well indeed, but of course not ______a local speaker in China.(本题2.5分) A、 so fluently as B、 more fluent than C、 as fluent as D、 much fluently than
参考答案:
6单选(4分) ∞ x k+1求幂级数∑  ̄ ̄ ̄ ̄的收敛域 k=1 n(n+1)
6单选(4分) ∞ x k+1求幂级数∑  ̄ ̄ ̄ ̄的收敛域 k=1 n(n+1)A.[-1,1]B.[-1,1)C.(-1,1)D.(-1,1]