A. 康德拉季耶夫周期 B. 库兹涅次周期 C. 固定资本投资周期 D. 库存周期
A. 烂疔 B. 颜面疔疮 C. 有头疽 D. 疫疔 E. 疽毒内陷
A. their own language B. their own literature C. their own tradition D. All of the above