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单项选择题 1. class super {  2. public float getNum() {return 3.0f;}  3. }  4.    5. public class Sub extends Super { 6.   7. }   Which method, placed at line 6, will cause a compiler error?()  

A、  Public float getNum()   {return 4.0f; }

B、  Public void getNum ()  { }

C、  Public void getNum (double d)   { }

D、  Public double getNum (float d) {retrun 4.0f; }

  • B
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