在UML可模型化的4种事件中，“信号”是一种异步事件，而“调用”一般是同步事件。
查看答案
UML表达模型元素之间关系的4个术语都体现了结构抽象的原理。
A. 对
B. 错
How do data and information differ?
A. data is a body of facts in a format suitable for decision making, while information is simply facts
B. they are the same
C. data is simply facts; information is a body of facts in a format suitable for decision making
D. data is associated with decision support systems; information is associated with ERP systems
What has emerged as the measuring stock for logistics information technology in the 21st century?
A. the Internet
B. electronic data interchange
C. wireless communication
D. enterprise resource planning systems
All of the following statements about logistics information systems are true, except:
A. “timely” can refer to the up-to-date status of information
B. internal sources of logistics information are relatively plentiful
C. “timely” can refer to how quickly a manager receives requested information
D. a LIS must be concerned with the nature and quality of data
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