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问题 单项选择题

James Martin给出信息工程的基本框架，其中实施时最基础的技术步骤是

A．确定主题数据库

B．建立企业模型

C．信息资源规划

D．建立数据模型

答案

参考答案：B

单项选择题

For GMDSS，which statement concerning a compulsory vessel is FALSE?（）

A.A conditional or partial exemption may be granted，in exceptional circumstances，for a single voyage outside the sea area for which the vessel is equipped

B.Once a compulsory vessel's GMDSS station has been fitted and inspected，the station must be inspected only once every five years

C.All passenger vessels and all cargo vessels that are 300 Gross Tons or larger must comply

D.Compulsory vessels must carry at least two licensed GMDSS Radio Operators
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单项选择题

设脂肪组织的有效原子序数为L1，肌肉组织的有效原子序数为L2，则二者的关系是（）

A.L1=L2

B.L1＜L2

C.L1≤L2

D.L1≥L2

E.L1＞L2
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