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男，30岁，右膝痛半月，以髌骨下缘疼痛明显，浮髌试验阳性，X线片未见异常，诊断是

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只要边际产量减少,总产量一定也减少。()

A. 正确
B. 错误

A ______ change in the market structure during this period was the downsizing of the call

A. conspicuous
B. rigorous
C. turbulent
D. notorious

When mentioning "the $4 million to $10 million range" (Lines 4, Para. 3), the author is talking about ______.

A. gold market
B. real estate
C. stock exchange
D. venture investment

在经济分析中,通常用边际报酬递增规律分析短期的产量变动,用规模报酬规律分析长期的产量变动。()

A. 正确
B. 错误