2011ҩѧרҵϰժҪע޾
FFoÖµ
дڵ⣺
1)¶ȲIJDZڲ¶
2)еľ췽Լ΢΢
˶епɿ֤FF0ΪɿԲ
(Ò»)DÖµZÖµ
1.Dֵ ΢Ȳָһ¶£΢ɱ90%(½һλ)ʱ䣬ԷӱʾDֵ˵΢ǿD=2.303/k
2.ZÖµ ¶ϵָijһ΢DÖµÙµÔ1/10ʱ(½һλʱ)ߵ¶ֵ()ͨȡ10æ¡£
Zֵһ¶ȷΧ(100桫138)lgDT֮Թϵ
Z =(T2CT1)/( lgD1ClgD2 )D1/D2 = 10(T2CT1)/Z
裺Z = 10棬T1 = 110棬T2 = 121棬D1/D2 = 1011/10
D1/D2 = 12.59D2= 0.079 D1
ʽΪ110101210.79ӵЧͬ
ҲZ=10ʱ¶ÿ1棬Ч21%
DֵZֵ˵ȷ
A.Dֵϵָһ¶£΢ɱ90%ʱ
B.Dֵϵָһ¶£΢ɱ10%ʱ
C.DֵС˵΢ǿ
D.DֵС˵΢Բ
E.Zֵϵָijһ΢DÖµÙµÔ1/10ʱߵ¶ֵ
𰸣BC
(Ò») FFoÖµ
1.F
F = t 10(T-T0)/ Z
t¶ȵļʱ(һΪ0.51)
Tÿʱ¶(ȵżҺвⶨ)
T0α¶(ѹʱΪ121棬ʱΪ170)
Fֵ壺Ϊ̵ĿɿԲFΪһ¶(T)ZֵΪ10Ч170Чͬʱ൱ʱ䡣
2.Foֵ ൱121ѹʱɱȫ΢Ҫʱ䡣¶µЧת121ĵЧֵF0Ϊ׼ʱ()F0ѹ
F0ʱ٣ϵʱ䡣
FoÖµÓ°Ø£
С״ȴ͸ϵ
ƷҺճȡ
ڵŲ
F0ֵD121ֵ΢Ķֵij˻˵΢F0 D121΢ijʼ
ΪȷЧӦע⣬Ӧȡִʩʹÿĺ10¡μFoʱӦʵӰȫأһ50%涨FoΪ8֣ʵʲӦFo12Ϊá
A FÖµ
B F0Öµ
C ZÖµ
D DÖµ
E T0Öµ
һ¶ɱ΢90%ʱ D
ЧͬʱʱٵÔ1/10¶ȵĶ C
ѹ̿ɿԲ B
̿ɿԲ A
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