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【单选题】
与原发性肝癌有关的病毒是A.
EB病毒
B.
人乳头瘤病毒
C.
人嗜T淋巴细胞病毒（HTLV-1）
D.
HBV
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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】设有关系模式R(运动员编号,比赛项目,成绩,比赛类别,比赛主管),用来存储每个运动员参加各项比赛的成绩以及各项比赛所属的类别和主管。如果规定:每个运动员参加一个比赛项目,只有一个成绩;每个比赛项目只属于一个比赛类别;每个比赛类别只有一个比赛主管。试回答下列问题: (1) 根据上述规定,写出关系模式R的基本函数依赖和候选码。 (2) 在函数依赖范畴内关系模式R最高属于第几范式?为什么? (3) 如果...
【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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