有以下程序: main() { int a=7,b=8,p,q,r; p=&a; q=&b; r=p; p=q; q=r; printf("%d,%d,%d,%d\n", p, q, a, b);}程序运行后的输出结果是( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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