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【判断题】
转动的黑洞称为克尔黑洞,它有内外两个视界,r± = M±√M 2 − a2;两个无限红移面rS = M ± √M 2 − a2cos2θ,单向膜区位于内外视界之间。无限红移面与视界之间存在能层。转动黑洞的中心有一个奇环。式 中a为单位质量的角动量,a = J/M .当角动量J → 0时,它退化为球对称的史瓦西黑洞;当角动量增加,a = M 时,它成为内外视界重合的极端黑洞;当角动量进一步增加,使得a > M 时,视界和单向膜区消失,奇点裸 露出来。()A.
正确
B.
错误
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举一反三
【单选题】Scarcity exists because
A.
society and people are greedy and wasteful.
B.
our wants exceed the resources available to satisfy them.
C.
of the inefficient choices we make.
D.
poor people need more food and other goods.
【简答题】下列有关主观判断法的说法正确的有（ ）。
【简答题】关于修正久期的说法正确的有（ ）。
【简答题】关于宪法的说法正确的有（ ）。
【简答题】下列有关作业成本法的说法正确的有（ ）。
【简答题】下面关于司法的说法正确的有（ ）。
【简答题】下列有关供给法则的说法正确的有（ ）。
【单选题】Peter: ________ has he lived in China?Susan: He has lived here for two years.
A.
How long
B.
How soon
C.
How much
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.
【单选题】Late-night Drinking Coffee lovers beware. Having a quick 'pick-me-up' cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melat...
A.
melatonin levels need to be raised.
B.
neurohormone can wake us up.
C.
coffee is a stimulant.
D.
decaf is a caffeinated coffee.
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