壩ͳһ
ͳһָͨԼڲȵĶⷽѡһͬļڣʱɱԵҪݵָѡŷķ
÷ظ̼ڷ־崦
1.ظ
ظҲƼСǽڵСΪȽϷļڣйָ꣬ݴ˽жȽϾߵһַ
2.̼ڷ
̼ڷֳڷָڽзľֵԭΪȶնĻϣ̵ٰļӦֵݵľֵָжȽϾߵһַ
ŶͶʾ
һ鷽Ȳֲų⣬ǿʵϻŶӣЩϻŶӷְȾͲȫⷽʽַУҪзIJԣ̭߱Եķ⣬ҪͬµйָĴСӶվߡ
߷
1ʽƵ£ɰÿһĿľֵNPVСŶӣȷȿǵĿ˳
2ʽܵʱ谴ֵNPVRָPIĴСϾֵNPVиŶӣѡʹ 
ϡ
£
һԸľֵʸߵΪۼͶʶͶܶбȽϡ
ڶֹijͶĿٶΪjۼͶʶǡôﵽͶܶʱ1jĿΪŵͶϡ
δֱҵϣ밴збҪ
1зֵjۼͶʶ״γͶʶɾ˳ӵĿۼͶʶȴСڻͶʶʱɽjڣj1λãۼͶʶֽС
2зֵjۼͶʶ״γͶʶһнڣj-1ԭʼͶʴڵjԭʼͶʱɽjڣj-1λãۼͶʶֽС
3ѲٽнδҵʹۼͶʶǡõͶʶĿʱɰһνĿΪϡ
֮ȽϾߵҪݾܷþܶľֵ
