单项选择题
A.NPV>0 B.NPV<0 C.NPV=0 D.NPV≥0
A.3.5 B.4.0 C.4.5 D.5.5
A.20% B.40% C.54% D.63%
A.2.44 B.2.54 C.2.60 D.2.82
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