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在如下源代码文件Test.java中, 哪个是正确的类定义?()
A.public class test { public int x = 0; public test(int x) { this.x = x; } }
B.public class Test{ public int x=0; public Test(int x) { this.x = x; } }
C.public class Test extends T1, T2 { public int x = 0; public Test (int x) { this.x = x; } }
D.public class
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