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洋葱 , 起源于中亚 , 伊朗、阿富汗北部及苏联中亚地区有野生种分布 , 近东和地中海沿岸为第二起源地。古埃及在公元前 320 年已食用洋葱 , 现存的记录显示 , 除了用钱 , 古埃及政府还会用洋葱和面包支付建造金字塔工人的报酬 ; 公元前 430 年古希腊及罗马学者先后描述了不同形状、颜色、品味的栽培种; 16 世纪传人美国并演化出多种生态型 ; 日本于 1627-1631 年开始 56 , 约在 20 世纪初传入中国。世界上现以中国、印度、美国、日本的洋葱种植面积较大。洋葱除了含有高蛋白质、粗纤维、糖类外 , 还含有丰富的多种维生素和钙、磷、铁、硒元素 , 以及多种氨基酸和咖啡酸、柠檬酸、硫化物等 ; 此外洋葱还含有前列腺以及激活血溶纤唯蛋白活性成分。所以 , 建议 “ 三高 ” 病人每天吃洋葱。
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【简答题】国际上常规四大切花是指()、()、()和()。
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A.
Joe has a constant returns to scale production function.
B.
Joe has a cost function that exhibits increasing returns.
C.
Joe is not minimizing costs.
D.
Joe's behavior is consistent with profit maximization.
E.
Joe's production function exhibits diminishing marginal product.
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