单选题

The author uses the example of the early models of high-speed railroad cars primarily to

A、 weaken the argument that modern engineering systems have major defects because of an absence of design courses in engineering curricula
B、 support the thesis that the number of errors in modern engineering systems is likely to increase
C、 illustrate the idea that courses in design are the most effective means for reducing the cost of designing engineering systems
D、 support the contention that a lack of attention to the nonscientific aspects of design results in poor conceptualization by engineers
E、 weaken the proposition that mathematics is a necessary part of the study of design

【正确答案】 D

【答案解析】