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【简答题】
用配方法化二次型 为标准形，并判别正定性．
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反馈参考答案：
举一反三
【简答题】A．fall B．flow C．roll D．gather
【简答题】A．fall B．flow C．roll D．gather
【单选题】Which of the following is NOT mentioned as a cause of the problem discussed in the passage?
A.
Natural barriers to sea water have been destroyed.
B.
The water table has gone down after droughts.
C.
Sea level has been continuously rising.
D.
Evaporation of water leaves salt behind.
【简答题】A．assemble B．collect C．disperse D．gather
【多选题】( ) are the films of the 20th Century Fox Corporation.
A.
Roman Holiday
B.
Titanic
C.
Avatar
D.
Forrest Gump
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