Could I borrow your car for a few days?()
A. Yes, you may borrow.
B. Yes, go on.
C. Sure, here is the key. Enjoy your journey.
D. It doesn't matter.
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边际收益(MR)用公式表示为()。
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
急性化脓性骨髓炎的特点()
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