以根弪入药的中药是:()。

单项选择题既能收敛止血,又能消肿生肌的药物为:()。

单项选择题When transportation costs are added to production costs, it becomes unprofitable to ship some products over a large distance. This is particularly true of products that: ( ) A.Have a low value-to-weight ratio.B.Have a high value-to-weight ratio.C.Can be produced only in one region.D.Require locally-sourced raw materials.