轮轨润滑装置的风压调整为()
A、750KPA
B、600KPA
C、650KPA
D、700KPA
参考答案:D
For which the following four-firm concentration ratios and Herfindahl-Hirschman indexes (HHI) indicates a highly competitive marketFour-Firm Ratio HHI () ①A. 5% 150 ②B. 98% 9500 ③C. 98% 150
A. ①
B. ②
C. ③
成书于清代的本草是
A.《本草纲目》
B.《证类本草》
C.《本草纲目拾遗》
D.《本草经集注》
E.《新修本草》