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【单选题】
国际牙科联合会系统16表示的牙是:A.
左上颌第一磨牙
B.
右上颌第二前磨牙
C.
右上颌第一磨牙
D.
右下颌第一磨牙
E.
左下颌第一磨牙
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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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