A. of diminishing marginal product. B. of increasing marginal product. C. marginal product first increases, then decreases. D. marginal product first decreases, then increases.
A. where the firm maximizes profit. B. at the minimum of average fixed cost. C. at the efficient scale. D. where fixed costs equal variable costs.
A. rising. B. falling. C. constant. D. The direction of change in average cost cannot be determined from this information.
A. 对 B. 错
A. 波状热 B. 不规则热 C. 稽留热 D. 弛张热 E. 间歇热
A. 重症肺炎 B. 肺结核 C. 胸腔积液 D. 气管肿瘤 E. 气胸
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