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f程序的运行结果是A12300B123C1D32138变量a中的数据用二进制表示的形式是01011101，变量b中的数据用二进制表示的形式是11110000。若要求将a的高4位取反，低4位不变，所要执行的运算是AabBabCabDa439在C语言中，r