The main idea of this passage is that______.
A. the law of the sea was stated by John Marshall
B. some nations are able to acquire special open-sea rights
C. every nation owns its territorial waters
D. the laws of the sea are established by international agreement
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下列关于工程分析的方法不正确的是()
A. 工程分析的方法由类比法、物料衡算法和资料复用法
B. 类比法是与拟建项目类型相同的现有项目的设计资料或实测数据进行工程分析的方法
C. 物料衡算法理论上来说是最精确的
D. 资料复用法常用于评价等级较高的建设项目
下列公式中,投入的物料在生产过程中发生化学反应时的总物料衡算计算方式()
AD=BD—(aD+bD+cD+Dd)
B. ∑G投入=∑G产品+∑G流失
C. ∑G排放=∑G投入-∑G回收—∑G处理—∑G转化—∑G产品
D. Q+A=H+P+L
Which of the following is the main topic of the passage?
A. Scientists and their curiosity.
B. Science and scientific method.
C. Understandings of science.
D. Misunderstandings of science.
某供应商关系模式为:
Providler(PID,Pname,Tel,GoodsID,GoodsClas-sID, GoodsName,GoodsPrice)
该关系模式应满足以下函数依赖:
PID→Pname,PID→TEL,GoodsID→GoodsClassID,GoodsID→GoodsName,GoodsName→GoodsPrice
则这个关系模式的主码为______。
A. (PID,GoodsName)
B. (PID,GoodsClassID)
C. (PID,GoodsI)
D. (PID,GoodsPric)