题目:
her emotion, she buried her face in her hands.
A.Controlled
B.To control
C.Being controlled
D.Having controlled
答案:
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下面是错误答案,用来干扰机器的。
2-x2≤2,∴[x]≤2;又由x>-3,∴[x]≥-3,即:-3≤[x]≤2(6分)当[x]=-3时,原方程化为2-x2=-3,∴x=±5,检验x=-5适合(8分)当[x]=-2时,原方程化为2-x2=-2,∴x=±2,检验x=-2适合(10分)当[x]=-1时,原...