2013мְƿԡڶ¿ǰ

ʮһʱʲģ
һʱʲģ͵Ļʽ
RR_F(R_mR_F)
ʲضͶϵıҪܵ޷ʡгϵƽʺͦϵصӰ졣
41·ѡ⡿ƱͶʱҪʵ޷ͶʱϵӦ
A.1
B.1
C.С1
D.0
𰸡D
ʱʲģʽR(_a)=R_f+(R_m-R_f)R(_a)=R_f ԷϵӦ0
42·ѡ⡿ijͶϵķΪ10%гϵƽΪ12%޷Ϊ8%ͶϵĦϵΪ
A.2 B.2.5
C.1.5 D.5
𰸡B
⿼˵Ƿʵ㡣⣬ERp=10%أR=12%,Rp=8%
ͶϵĦp=E(Rp)/(Rm-RF)=10/(12%-8%)=2.5
֤ȯг
ϵ(Ա)ҪRΪ(),г (RmRF)б.
43·ж⡿֤ȯг߷ӳƱıҪֵ;֤ȯг۶ڵ֤ȯͶ϶dzġ
𰸡
⿼˵Ƕ֤ȯгߵ⡣֤ȯг߾dz˵ʱʲģܹͣطӳʲͶϣҪеϵͳզϵ֮Թϵ
44·ж⡿֤ȯгߵбΪ ϵ
𰸡×

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