A. 骨质增生 B. 骨质破坏 C. 好发于短骨干 D. 好发于扁骨 E. 骨质增生和骨质破坏并存
A. Yes, you may borrow. B. Yes, go on. C. Sure, here is the key. Enjoy your journey. D. It doesn't matter.
A. 边际收益=固定收益/产量 B. 边际收益=总收益/产量 C. 边际收益=总收益增值/产量增值 D. 边际收益=可变收益/产量
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