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【单选题】
设f(x)具有导数，y=f(x2)，则 的值是( )。A.
f'(4)
B.
16f'(4)
C.
2f'(4)+16f'(4)
D.
2f'(4)+4f'(4)
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举一反三
【单选题】At the airport, I could hear nothing except the roar of aircraft engines which all other sounds.
A.
diminished
B.
drowned
C.
dwarfed
D.
devastated
【单选题】Often he _________ sit for hours doing nothing at all when he was in low spirits.A．shouldB．would
A.
23. Often he _________ sit for hours doing nothing at all when he was in low spirits. A．should
B.
would
C.
might
D.
Could
【单选题】All flight ____ because of the snowstorm, many passengers could do nothing but stay at the airport.
A.
had been cancelled
B.
were cancelled
C.
having been cancelled
D.
have been cancelled
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