【名词&注释】
波特率(baud rate)、数据传输率(data transfer rate)、持续时间(duration)、存储量(memory capacitance)、数据量(data quantity)、双声道立体声(dual channel stereophonic)
[单选题]Information engineering emphasizes a modeling tool called ______ relationship diagrams.
A. entity
B. class
C. state
D. sequence