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The push for excellence is powerful all the way through to higher education.

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设关系模式R(A，B，C，D，E)，Rdz的函数依赖集F＝A→B，C→D，D→E，则R的候选键是【7】。

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阅读下面代码： import java.awt.*; public class Exam11_1 { private Frame f; private Button bl,b2,b3,b4; public static void main(String args[] { Exam11_1 that = new Exam11_1 (); that. go(); } public void go () { ______; f.setLayout(new FlowLayout());; bl = new Button ("Button 1"); b2 = new Button ("Button 2"); b3 = new Button ("Button 3"); b4 = new Button ("Button 4"); f.add(b1); f.add(b2); f.add(b3); f.add(b4); f.pack(); f.setVisible(true); } } 请在程序中画线处填写正确的语句【13】，以便编译运行程序后得到正确的结果。

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反馈抑制器抑制声反馈的能力非常强，能自动探测到可能产生啸叫的频率点，并很快予以衰减，所以扩声系统中只要用了反馈抑制器，就不用怕再产生啸叫了。( )

A. 对
B. 错

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Passage OneQuestions 26 to 28 are based on the passage you have just heard.

A. To save up some money.
B. To enjoy yourself most before you move.
C. To read more books to know more about the life in the small town.
D. To spend some time in a village to make sure if you are used to the life there.

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The push for excellence is powerful all the way through to higher education.

设关系模式R(A，B，C，D，E)，Rdz的函数依赖集F＝A→B，C→D，D→E，则R的候选键是 【7】 。

反馈抑制器抑制声反馈的能力非常强，能自动探测到可能产生啸叫的频率点，并很快予以衰减，所以扩声系统中只要用了反馈抑制器，就不用怕再产生啸叫了。( )

Passage OneQuestions 26 to 28 are based on the passage you have just heard.

设关系模式R(A，B，C，D，E)，Rdz的函数依赖集F＝A→B，C→D，D→E，则R的候选键是【7】。