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[单选题]函数y-=ƒ(x)满足ƒ(1)=2ƒ″(1)=0,且当x<1时,ƒ″(x)<0;当x>1时,ƒ″(x)>0,则有( ).
A. x=1是驻点
B. x=1是极值点
C. x=1是拐点
D. 点(1,2)是拐点
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学习资料:
[单选题]What the monitor said at the class meeting ________ quite all right.
A. heard
B. listening
C. sounded
D. pronounced
[单选题]I wonder_______ we could have a talk after the meeting,
A. which
B. why
C. that
D. if
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