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【多选题】
我国现在固定资产的折旧方法主要有（）。
A.
平均年限法
B.
净现值法
C.
工作量法
D.
加速折旧法
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【单选题】已知f(x)=(m-1)x 2 +2mx+3为偶函数，则f(x)在(2，5)上是 [     ]
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