女性，50岁，咳嗽、呼吸困难半年。纤支镜活检示肺泡壁不同程度的炎症和纤维化，间质可见淋巴细胞和浆细胞浸润
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As more labor is allocated to industry, there is______.
A. diminishing return to capital
B. diminishing return to labor
C. increasing return to scale
D. increasing return to labor
男性，72岁，突发腹痛伴血尿，尿量50ml/24h，BUN21mmol/L，Cr402μmol/L，治疗后，尿量700ml/24h，BUN8mmol/L，Cr105μmol/L
A price ceiling______.
A. usually causes a shortage in a market
B. is a form. of self-regulation by a group of firms in a market
C. is set above the equilibrium price
D. usually results in the quantity supplied exceeding the quantity demanded
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