词汇	二阶统计量
释义	二阶统计量 second order statistics
随便看	productive capitalist productive capital of manpower productive capital project productive capital stock productive card productive cartel productive cell productive character productive city productive class productive commerce Productive comparative advantage productive competence productive complex productive condition productive condition of brain tumor productive conditions productive conscientiousness productive construction productiveconstruction investment productive construction investment productive consumption productive cooperation Productive cost productive cough