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【单选题】
若有以下程序段: int *p,*q,a=10,b=20; p=&a; q=&b; p=q; printf(''%d,%d,%d,%d\n'',a,b,*p,*q); 则该程序段执行后的输出结果是( ) 。
A.
10,20,20,20
B.
10,10,20,20
C.
20,20,20,20
D.
10,20,10,20
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A.
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B.
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A.
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B.
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C.
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B.
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D.
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A.
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B.
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C.
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D.
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A.
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A.
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B.
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D.
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