ʮһʱʲģ
һʱʲģ͵Ļʽ
RRF(RmRF)
ʲضͶϵıҪܵʡгϵƽʺͦϵصӰ졣
41·ѡ⡿ƱͶʱҪʵͶʱϵӦ
A.1
B.1
C.С1
D.0
𰸡D
ʱʲģʽR(a)=Rf+(Rm-Rf)R(a)=Rf 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×