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【单选题】
下列关于最优证券组合的说法，正确的是( )。A.
最优组合是收益最大的组合
B.
最优组合是风险最小的组合
C.
相对于其他有效组合，最优组合所在的无差异曲线的位置最高
D.
最优组合是无差异曲线簇与有效边界的交点所表示的组合
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【简答题】When discussing transportation, what should be taken into consideration?
【单选题】Meanwhile, an uncaring public barely watches, convinced that the issue has no significance, and publicity-conscious senators and politicians increasingly give way to the lobbying of animal rights acti...
A.
At the same time, th e general public seldom act like bystanders, believing that the issue is important . The senators and politicians keep making concessions to activists advocating animal rights.
B.
At the same time, the general public barely act like bystanders, believing that the issue is no big deal. The senators and politicians, who are familiar with the public issues, keep making concessions to activists who advocat e animal rights.
C.
At the same time, the general public act like bystanders, deny ing that the issue is no thing important . The senators and politicians, who are familiar with the public issues, keep making concessions to activists who advocat e animal rights.
【简答题】What factors need to be considered when choosing transportation modes?
【单选题】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: 当运输成本增加到生产成本时,远距离运输一些产品就变得无利可图...
A.
have a low value-to-weight ratio.具有较低的价值重量比。
B.
have a high value-to-weight ratio.拥有较高的价值重量比。
C.
can be produced only in one region.只能在一个地区生产
D.
require locally-sourced raw materials.需要本地采购的原材料
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