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【单选题】
以下程序的输出结果为 。 #define PT 5.5 #define S(x) PT*x*x main (){ int a=1,b=2; printf(“%4.1f ”,S(a+b)); }A.
12.0
B.
9.5
C.
12.5
D.
33.5
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A.
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B.
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C.
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B.
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C.
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D.
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