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【单选题】
设事件A,B仅发生一个的概率为0.3,且 ,则A,B至少有一个不发生的概率为( )。A.
0.2
B.
0.8
C.
0.3
D.
0.5
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【单选题】若有定义enum color {red,yellow=2,blue,white,black} r=white;执行printf("%d",r);后的输出结果是（ ）。
A.
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