设A={2,4,6,12},a*b = gcd(a,b),即a、b的最大公约数。代数系统的幺元是_____,零元是_____。
122
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在风险识别中,头脑风暴法的应用规则包括( )
①自由畅想;②限时限人;③突出求异创新;④以量求质