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【单选题】
( )是指设备从开始使用到其等值年成本最小的使用年限。A.
折旧寿命
B.
物理寿命
C.
技术寿命
D.
经济寿命
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举一反三
【单选题】A decline in the effective duration of a callable bond most likely implies that a bond’s:
A.
yield-to-worst has risen.
B.
yield-to-maturity has risen.
C.
benchmark yield curve has shifted upwards.
【单选题】The presence of an embedded call option will decrease the effective duration of a bond:
A.
only when interest rates are rising.
B.
only when interest rates are falling.
C.
for both rising and falling interest rates.
【单选题】The duration of effective refractory period (ERP) of cardiac muscle cells is mainly determined by ( )
A.
velocity of depolarization during 0 period (quick depolarization period)
B.
size of overshoot value
C.
duration of plateau
D.
level of resting potential (RP)
E.
level of threshold potential (TP)
【简答题】duration For aerobic exercise to be effective, it has to be long ________________. .
【简答题】热值有粗热值和净热值之分，以下关于粗热值和净热值的说法正确的是（ ）。
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