题目:
Which of the following is the most likely result of a technological improvement in a perfectly competitive industry()
A. Individual firms’ supply curves shift to the left.
B. The industry supply curve shifts to the right.
C. The costs for individual firms increase.
答案:
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参考答案:解析:在阅读机床传动系统图时,第一步先分析整台机床有几条传动系统,每条中首端件、末端件是哪一种;第二步,分析整合机床的传动路线,由哪些传动零件组成,传动零件的传动方式,传动关系怎样,也就...