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【单选题】
The 'Mozart problem' , as defined by the author, is that______.A.
it is difficult to understand Mozart's letters and his music
B.
there is little connection between his personality and his music
C.
Mozart gave us nothing of a clue about his music in his letters
D.
his music is quite different from that of Beethoven or Wagner
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【简答题】新产品按产品的创新和改进程度可分为全新产品、_____、改进新产品。
【简答题】求函数f(x，y)=x 3 -y 3 +3x 2 +3y 2 -9x的极值．
【简答题】Why do the police ask them to disperse? Because a demonstration without approval is ________ . For legal assembly and demonstration, you must apply to the public security bureau.
【单选题】What is the ongoing demonstration against?
A.
Bureaucracy.
B.
Public transportation.
C.
High housing prices.
D.
Unemployment.
【单选题】函数的反函数y=2 x +3（x∈R）的反函数的解析式为（ ）
A.
y=log 2 （x-3），（x＞3）
B.
y=log 2 x-3，（x＞3）
C.
y=log 3 x-2，（x＞0）
D.
y=log 3 （x-2），（x＞2）
【简答题】求函数f(x，y)=x 3 -y 3 +3x 2 +3y 2 -9x的极值．
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